diff --git a/.github/workflows/tox.yaml b/.github/workflows/tox.yaml
index 5b0dcca..4012573 100644
--- a/.github/workflows/tox.yaml
+++ b/.github/workflows/tox.yaml
@@ -32,8 +32,4 @@ jobs:
           pipx install tox
           pipx install poetry
       - name: Run all tox tests
-        if: github.event_name != 'pull_request'
-        run: tox --
-      - name: Run tox tests (fast only)
-        if: github.event_name == 'pull_request'
-        run: tox -- '-k not slow'
\ No newline at end of file
+        run: tox --
\ No newline at end of file
diff --git a/README.md b/README.md
index 078df4c..8d2f84a 100644
--- a/README.md
+++ b/README.md
@@ -1,406 +1,59 @@
-# Poetry Demo
+# DataJoint File Validator
 
-This repository contains a demonstration for how to initialize a basic Python package.
+This repository contains a Python package that validates file sets for DataJoint pipelines.
 
-## Features
+## Installation
 
-- Runs pytests on pushes to default branch
-- Deployment to PyPI when a version tag (`v.*.*`) is pushed
-- Pip installable from source: `pip install -e .`
-
-## Tools Used in this Repository
-
-- Virtual environment, package management, and PyPI deployment using [`poetry`](https://python-poetry.org/)
-- Unit testing using [`pytest`](https://pytest.org) and [`tox`](https://tox.wiki/en/latest/)
-- Automated testing and PyPI deployments using GitHub Actions CI/CD
-
-## Tutorial
-
-Initialize git and poetry interactively
-```console
-$ git init
-Initialized empty Git repository in /home/eho/ripl/repos/poetry-demo/.git/
-$ git checkout -b main
-$ git branch -d master
-$ poetry init                                
-
-This command will guide you through creating your pyproject.toml config.
-
-Package name [poetry-demo]:  
-Version [0.1.0]:  
-Description []:  Example PyPI package deployment using poetry
-Author [Ethan Ho <eho@tacc.utexas.edu>, n to skip]:   
-License []:  MIT
-Compatible Python versions [^3.8]:  
-
-Would you like to define your main dependencies interactively? (yes/no) [yes] no
-Would you like to define your development dependencies interactively? (yes/no) [yes] yes
-You can specify a package in the following forms:
-  - A single name (requests)
-  - A name and a constraint (requests@^2.23.0)
-  - A git url (git+https://github.com/python-poetry/poetry.git)
-  - A git url with a revision (git+https://github.com/python-poetry/poetry.git#develop)
-  - A file path (../my-package/my-package.whl)
-  - A directory (../my-package/)
-  - A url (https://example.com/packages/my-package-0.1.0.tar.gz)
-
-Search for package to add (or leave blank to continue): pytest
-Found 20 packages matching pytest
-
-Enter package # to add, or the complete package name if it is not listed: 
- [0] pytest
- [1] pytest123
- [2] 131228_pytest_1
- [3] pytest-black
- [4] pytest-libnotify
- [5] pytest-automation
- [6] pytest-ringo
- [7] pytest-integration
- [8] pytest-enhancements
- [9] pytest-mercurial
- > 0
-Enter the version constraint to require (or leave blank to use the latest version):      
-Using version ^7.0.1 for pytest
-
-Add a package: pytest-dotenv
-Found 20 packages matching pytest-dotenv
-
-Enter package # to add, or the complete package name if it is not listed: 
- [0] pytest-dotenv
- [1] pytest-django-dotenv
- [2] dotenv
- [3] dotenv-config
- [4] typed-dotenv
- [5] py-dotenv
- [6] dotenv-cli
- [7] django-dotenv
- [8] pythonsite-dotenv
- [9] firstclass-dotenv
- > 0
-Enter the version constraint to require (or leave blank to use the latest version): 
-Using version ^0.5.2 for pytest-dotenv
-
-Add a package: 
-
-Generated file
-
-[tool.poetry]
-name = "poetry-demo"
-version = "0.1.0"
-description = "Example PyPI package deployment using poetry"
-authors = ["Ethan Ho <eho@tacc.utexas.edu>"]
-license = "MIT"
-
-[tool.poetry.dependencies]
-python = "^3.8"
-
-[tool.poetry.dev-dependencies]
-pytest = "^7.0.1"
-pytest-dotenv = "^0.5.2"
-
-[build-system]
-requires = ["poetry-core>=1.0.0"]
-build-backend = "poetry.core.masonry.api"
-
-
-Do you confirm generation? (yes/no) [yes] 
-```
-
-We then install the dependencies that we defined in the above `pyproject.toml` file:
-
-```console
-$ poetry install
-Creating virtualenv poetry-demo-rPLVa0Kh-py3.8 in /home/eho/.cache/pypoetry/virtualenvs
-Updating dependencies
-Resolving dependencies... (5.9s)
-
-Writing lock file
-
-Package operations: 10 installs, 0 updates, 0 removals
-
-  • Installing pyparsing (3.0.7)
-  • Installing attrs (21.4.0)
-  • Installing iniconfig (1.1.1)
-  • Installing packaging (21.3)
-  • Installing pluggy (1.0.0)
-  • Installing py (1.11.0)
-  • Installing tomli (2.0.1)
-  • Installing pytest (7.0.1)
-  • Installing python-dotenv (0.19.2)
-  • Installing pytest-dotenv (0.5.2)
-```
-
-We can now add our package source code to a subdirectory named `poetry_demo`. Note that the module directory should be snake_cased.
-
-```
-$ mkdir poetry_demo
-$ touch poetry_demo/__init__.py poetry_demo/__main__.py
-$ echo 'import pandas as pd' > poetry_demo/__init__.py
-```
-
-Note that we're importing `pandas` in our package. Poetry makes it easy to add package dependencies:
-
-```console
-$ poetry add pandas
-Using version ^1.4.1 for pandas
-
-Updating dependencies
-Resolving dependencies... (17.2s)
-
-Writing lock file
-
-Package operations: 5 installs, 0 updates, 0 removals
-
-  • Installing six (1.16.0)
-  • Installing numpy (1.22.2)
-  • Installing python-dateutil (2.8.2)
-  • Installing pytz (2021.3)
-  • Installing pandas (1.4.1)
-```
-
-Let's set up testing for this package. We will do this by following the canonical file structure for [pytest](https://docs.pytest.org/en/7.0.x/explanation/goodpractices.html#choosing-a-test-layout-import-rules). 
-
-```console
-$ mkdir tests
-$ echo 'import poetry_demo' > tests/test_import.py      
-```
-
-We can install `pytest` as a development dependency. This means that it will be installed when a developer (or CI workflow) runs `poetry install` from the repository root, but it will not be included in the build. We'll also install `pytest-dotenv` so that environment vars in a `.env` file will be available in pytests.
-
-```console
-$ poetry add --dev pytest pytest-dotenv
-$ echo 'ENV_USED_IN_PYTESTS=0' > .env
-```
-
-Prefixing commands with `poetry run` runs them in the poetry-managed virtual environment. Let's run our test suite:
-
-```console
-$ poetry run pytest 
-======================================= test session starts ========================================
-platform linux -- Python 3.8.10, pytest-7.0.1, pluggy-1.0.0
-rootdir: /home/eho/ripl/repos/poetry-demo
-plugins: dotenv-0.5.2
-collected 0 items                                                                                  
-
-====================================== no tests ran in 0.36s =======================================
-```
-
-Similarly, we can invoke `.py` scripts, open an interactive `ipython` session, or open an interactive shell environment (similar to `source my_virtual_env/bin/activate`):
-
-```console
-$ poetry run python3 poetry_demo/__main__.py
-$ poetry run ipython                        
-/home/eho/.local/lib/python3.8/site-packages/IPython/core/interactiveshell.py:802: UserWarning: Attempting to work in a virtualenv. If you encounter problems, please install IPython inside the virtualenv.
-  warn(
-Python 3.8.10 (default, Nov 26 2021, 20:14:08) 
-Type 'copyright', 'credits' or 'license' for more information
-IPython 8.0.1 -- An enhanced Interactive Python. Type '?' for help.
-
-[ins] In [1]: from poetry_demo import *
-
-[ins] In [2]:                                                                                       
-Do you really want to exit ([y]/n)? y
-$ poetry shell       
-Spawning shell within /home/eho/.cache/pypoetry/virtualenvs/poetry-demo-rPLVa0Kh-py3.8
-$ deactivate   
-```
-
-We can use poetry to build and publish the package to PyPI. All we need are our PyPI credentials:
-
-```console
-$ poetry build         
-Building poetry-demo (0.1.0)
-  - Building sdist
-  - Built poetry-demo-0.1.0.tar.gz
-  - Building wheel
-  - Built poetry_demo-0.1.0-py3-none-any.whl
-$ poetry publish
-
-No suitable keyring backends were found
-Using a plaintext file to store and retrieve credentials
-Username: ^C%                                                                                       
-```
-
-We can automate PyPI deployment using GitHub Actions continuous integration and deployment (CI/CD). The deployment will trigger when we push git tags that match the glob query `v.*.*`.
-```console
-$ mkdir -p .github/workflows                             
-$ touch .github/workflows/pypi.yaml                      
-$ code .github/workflows/pypi.yaml
-$ cat .github/workflows/pypi.yaml
-name: PyPI
-
-on:
-  push:
-    tags:
-      # run whenever a version tag is pushed, e.g. v1.1.0
-      - "v*.*.*"
-    paths-ignore:
-      # don't run when docs are pushed
-      - '**.md'
-      - 'docs/**'
-      - 'docsrc/**'
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Publish GH release
-        uses: softprops/action-gh-release@v1
-      - name: Build using poetry and publish to PyPi
-        uses: JRubics/poetry-publish@v1.8
-        with:
-          pypi_token: ${{ secrets.PYPI_TOKEN }}% 
+```bash
+pip install datajoint_file_validator@git+https://github.com/ethho/datajoint-file-validator.git
 ```
 
-Note that we would need to enter a valid [PyPI API token](https://packaging.python.org/en/latest/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/?highlight=access%20token#saving-credentials-on-github) in GitHub secrets under the name `PYPI_TOKEN`.
-
-Also note that as of writing, GitHub Actions offers unlimited Actions executions free of charge for public repositories.
-
-Let's do some more work on our testing environment. [`tox`](https://tox.wiki/en/latest/) allows us to test our package against multiple Python versions, and it integrates with `poetry` and GitHub Actions. All we need is to install `tox` (`pip install tox`) and write a `tox.ini` file at the repository root:
-```console
-$ touch tox.ini                      
-$ code tox.ini  
-$ cat tox.ini
-[tox]
-isolated_build = true
-envlist = py38
-
-[testenv]
-allowlist_externals = 
-    poetry
-commands =
-    poetry install 
-	; Check that the package is importable
-    poetry run python -c 'import poetry_demo'
-    poetry run pytest %                                                                                
-$ tox          
-.package create: /home/eho/ripl/repos/poetry-demo/.tox/.package
-.package installdeps: poetry-core>=1.0.0
-py38 create: /home/eho/ripl/repos/poetry-demo/.tox/py38
-py38 inst: /home/eho/ripl/repos/poetry-demo/.tox/.tmp/package/1/poetry-demo-0.1.0.tar.gz
-py38 installed: numpy==1.22.2,pandas==1.4.1,poetry-demo @ file:///home/eho/ripl/repos/poetry-demo/.tox/.tmp/package/1/poetry-demo-0.1.0.tar.gz,python-dateutil==2.8.2,pytz==2021.3,six==1.16.0
-py38 run-test-pre: PYTHONHASHSEED='618313639'
-py38 run-test: commands[0] | poetry install
-Installing dependencies from lock file
+## Quick Start
 
-Package operations: 10 installs, 0 updates, 0 removals
+Validate a fileset against an existing manifest:
 
-  • Installing pyparsing (3.0.7)
-  • Installing attrs (21.4.0)
-  • Installing iniconfig (1.1.1)
-  • Installing packaging (21.3)
-  • Installing pluggy (1.0.0)
-  • Installing py (1.11.0)
-  • Installing tomli (2.0.1)
-  • Installing pytest (7.0.1)
-  • Installing python-dotenv (0.19.2)
-  • Installing pytest-dotenv (0.5.2)
+```python
+from datajoint_file_validator import validate
 
-Installing the current project: poetry-demo (0.1.0)
-py38 run-test: commands[1] | poetry run python -c 'import poetry_demo'
-py38 run-test: commands[2] | poetry run pytest
-========================================= test session starts =========================================
-platform linux -- Python 3.8.10, pytest-7.0.1, pluggy-1.0.0
-cachedir: .tox/py38/.pytest_cache
-rootdir: /home/eho/ripl/repos/poetry-demo
-plugins: dotenv-0.5.2
-collected 0 items                                                                                     
+my_dataset_path = 'tests/data/filesets/fileset0'
+manifest_path = 'datajoint_file_validator/manifests/demo_dlc_v0.1.yaml'
+success, report = validate(my_dataset_path, manifest_path, verbose=True, format='plain')
+# Validation failed with the following errors:
+# [
+#     {
+#         'rule': 'Min total files',
+#         'rule_description': 'Check that there are at least 6 files anywhere in the fileset',
+#         'constraint_id': 'count_min',
+#         'constraint_value': 6,
+#         'errors': 'constraint `count_min` failed: 4 < 6'
+#     }
+# ]
 
-======================================== no tests ran in 0.29s ========================================
-ERROR: InvocationError for command /home/eho/.poetry/bin/poetry run pytest (exited with code 5)
-_______________________________________________ summary _______________________________________________
-ERROR:   py38: commands failed
+print(success)
+# False
 ```
 
-Tox reports failure because we don't have any real pytests (functions named like `test_*`) in the directory `./tests`.
-We can set up a GitHub Actions workflow that automatically runs tox on pushes to pull requests or the `main` branch:
+Alternatively, validate using the included command line interface:
 
 ```console
-$ touch .github/workflows/tox.yaml
-$ code .github/workflows/tox.yaml
-$ cat .github/workflows/tox.yaml
-name: Tox
-
-on:
-  push:
-    branches:
-      - main
-    paths-ignore:
-      - '**.md'
-      - 'docs/**'
-      - 'docsrc/**'
-
-  pull_request:
-    branches:
-      - main
-    paths-ignore:
-      - '**.md'
-      - 'docs/**'
-      - 'docsrc/**'
-
-jobs:
-  test:
-    name: Run unit tests in tox
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.7
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.7'
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.8'
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.9'
-      - name: Install Python dependencies
-        run: python -m pip install -q poetry tox
-      - name: Run all tox tests
-        if: github.event_name != 'pull_request'
-        run: tox --
-      - name: Run tox tests (fast only)
+$ datajoint-file-validator validate tests/data/filesets/fileset0 datajoint_file_validator/manifests/demo_dlc_v0.1.yaml
+❌ Validation failed with 1 errors!
+┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┓
+┃                ┃ Rule           ┃               ┃ Constraint    ┃                ┃
+┃ Rule ID        ┃ Description    ┃ Constraint ID ┃ Value         ┃ Errors         ┃
+┡━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━┩
+│ Min total      │ Check that     │ count_min     │ 6             │ constraint     │
+│ files          │ there are at   │               │               │ `count_min`    │
+│                │ least 6 files  │               │               │ failed: 4 < 6  │
+│                │ anywhere in    │               │               │                │
+│                │ the fileset    │               │               │                │
+└────────────────┴────────────────┴───────────────┴───────────────┴────────────────┘
 ```
 
-We'll add a standard Python `.gitignore` file:
+## Author
 
-```console
-$ wget https://raw.githubusercontent.com/github/gitignore/main/Python.gitignore 
---2022-02-28 15:00:34--  https://raw.githubusercontent.com/github/gitignore/main/Python.gitignore
-Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.199.111.133, 185.199.108.133, 185.199.109.133, ...
-Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.199.111.133|:443... connected.
-HTTP request sent, awaiting response... 200 OK
-Length: 2762 (2.7K) [text/plain]
-Saving to: ‘Python.gitignore’
-
-Python.gitignore         100%[==================================>]   2.70K  --.-KB/s    in 0.001s  
+Ethan Ho @ethho
 
-2022-02-28 15:00:35 (2.12 MB/s) - ‘Python.gitignore’ saved [2762/2762]
-FINISHED --2022-02-28 15:00:35--
-Total wall clock time: 0.1s
-Downloaded: 1 files, 2.7K in 0.001s (2.12 MB/s)
-$ mv Python.gitignore .gitignore
-```
+## License
 
-Finally, we create our first git commit and push our changes to a new GitHub repository using the [GitHub CLI](https://cli.github.com/).
-
-```console
-$ git add .
-$ git commit -m 'Initial commit'
-❯ gh repo create                  
-? What would you like to do? Push an existing local repository to GitHub
-? Path to local repository .
-? Repository name poetry-demo
-? Description Example Python package using poetry, tox, and GitHub Actions
-? Visibility Public
-✓ Created repository ethho/poetry-demo on GitHub
-? Add a remote? Yes
-? What should the new remote be called? origin
-✓ Added remote git@github.com:ethho/poetry-demo.git
-? Would you like to push commits from the current branch to the "origin"? Yes
-✓ Pushed commits to git@github.com:ethho/poetry-demo.git
-$ gh repo view --web
-```
\ No newline at end of file
+[MIT](LICENSE)
\ No newline at end of file
diff --git a/datajoint_file_validator/__init__.py b/datajoint_file_validator/__init__.py
index 371a0f3..94731ed 100644
--- a/datajoint_file_validator/__init__.py
+++ b/datajoint_file_validator/__init__.py
@@ -1,3 +1,5 @@
-from . import (
-    snapshot, validate, manifest, result
-)
+from . import snapshot, main, manifest, result
+from .snapshot import Snapshot
+from .manifest import Manifest
+from .result import ValidationResult
+from .main import validate_snapshot, validate
diff --git a/datajoint_file_validator/cli.py b/datajoint_file_validator/cli.py
index 8945bd5..e85f4e1 100644
--- a/datajoint_file_validator/cli.py
+++ b/datajoint_file_validator/cli.py
@@ -1,8 +1,11 @@
 import typer
+from enum import Enum
 from typing_extensions import Annotated
+import yaml
 from rich import print as rprint
 from rich.console import Console
 from rich.table import Table
+from . import main
 
 console = Console()
 app = typer.Typer()
@@ -15,7 +18,6 @@ def callback():
     """
 
 
-@app.command()
 def show_table():
     table = Table("Name", "Item")
     table.add_row("Rick", "Portal Gun")
@@ -23,7 +25,6 @@ def show_table():
     console.print(table)
 
 
-@app.command()
 def open_file(path: str):
     """
     Open a file at PATH in the default app.
@@ -32,7 +33,6 @@ def open_file(path: str):
     typer.launch(path, locate=True)
 
 
-@app.command()
 def read_file(path: Annotated[typer.FileText, typer.Option()]):
     """
     Reads lines from a file at PATH.
@@ -41,8 +41,7 @@ def read_file(path: Annotated[typer.FileText, typer.Option()]):
         rprint(f"Config line: {path}")
 
 
-@app.command()
-def main(name: str, lastname: str = "", formal: bool = False):
+def _main(name: str, lastname: str = "", formal: bool = False):
     """
     Say hi to NAME, optionally with a --lastname.
 
@@ -52,3 +51,39 @@ def main(name: str, lastname: str = "", formal: bool = False):
         rprint(f"Good day Ms. {name} {lastname}.")
     else:
         rprint(f"Hello {name} {lastname}")
+
+
+class DisplayFormat(str, Enum):
+    table = "table"
+    yaml = "yaml"
+    plain = "plain"
+
+
+@app.command()
+def validate(
+    target: Annotated[str, typer.Argument(..., exists=True)],
+    manifest: Annotated[str, typer.Argument(..., exists=True)],
+    raise_err: bool = False,
+    format: DisplayFormat = DisplayFormat.table,
+):
+    """
+    Validate a target against a manifest.
+    """
+    success, report = main.validate(
+        target, manifest, verbose=False, raise_err=raise_err
+    )
+    if success:
+        rprint(":heavy_check_mark: Validation successful!")
+        return
+
+    rprint(f":x: Validation failed with {len(report)} errors!")
+    if format == DisplayFormat.table:
+        table = main.table_from_report(report)
+        console = Console()
+        console.print(table)
+    elif format == DisplayFormat.yaml:
+        rprint()
+        rprint(yaml.dump(report))
+    elif format == DisplayFormat.plain:
+        rprint(report)
+    raise typer.Exit(code=1)
diff --git a/datajoint_file_validator/config.py b/datajoint_file_validator/config.py
new file mode 100644
index 0000000..0dde7e2
--- /dev/null
+++ b/datajoint_file_validator/config.py
@@ -0,0 +1,12 @@
+from dataclasses import dataclass
+
+
+@dataclass
+class Config:
+    """Config class for the application"""
+
+    allow_eval: bool = True
+    debug: bool = True
+
+
+config = Config()
diff --git a/datajoint_file_validator/constraint/__init__.py b/datajoint_file_validator/constraint/__init__.py
new file mode 100644
index 0000000..8753668
--- /dev/null
+++ b/datajoint_file_validator/constraint/__init__.py
@@ -0,0 +1,170 @@
+import re
+from dataclasses import dataclass
+from typing import Any, Iterable, Callable, Tuple
+from cerberus import Validator
+from ..config import config
+from ..snapshot import Snapshot
+from ..result import ValidationResult
+from ..error import DJFileValidatorError
+
+Schema = Any
+
+
+@dataclass(frozen=True)
+class Constraint:
+    """A single constraint that evaluates True or False for a fileset."""
+
+    def validate(self, snapshot: Snapshot) -> ValidationResult:
+        """Validate a snapshot against a single constraint."""
+        raise NotImplementedError(
+            "Subclass of Constraint must implement validate() method."
+        )
+
+    @property
+    def name(self):
+        _name = getattr(self, "_name", None)
+        return _name if _name else self.__class__.__name__
+
+
+@dataclass(frozen=True)
+class CountMinConstraint(Constraint):
+    """Constraint for `count_min`."""
+
+    val: int
+
+    def validate(self, snapshot: Snapshot) -> ValidationResult:
+        status = len(snapshot) >= self.val
+        return ValidationResult(
+            status=status,
+            message=None
+            if status
+            else f"constraint `{self.name}` failed: {len(snapshot)} < {self.val}",
+            context=dict(snapshot=snapshot, constraint=self),
+        )
+
+
+@dataclass(frozen=True)
+class CountMaxConstraint(Constraint):
+    """Constraint for `count_max`."""
+
+    val: int
+
+    def validate(self, snapshot: Snapshot) -> ValidationResult:
+        status = len(snapshot) <= self.val
+        return ValidationResult(
+            status=status,
+            message=None
+            if status
+            else f"constraint `{self.name}` failed: {len(snapshot)} > {self.val}",
+            context=dict(snapshot=snapshot, constraint=self),
+        )
+
+
+@dataclass(frozen=True)
+class SchemaConvertibleConstraint(Constraint):
+    def to_schema(self) -> Schema:
+        """
+        Convert this constraint to a Cerberus schema that each file in
+        the Snapshot will be validated against.
+        """
+        raise NotImplementedError(
+            "Subclass of SchemaConvertibleConstraint must implement to_schema() method."
+        )
+
+    @staticmethod
+    def _validate_file(schema: Schema, file: dict) -> Validator:
+        v = Validator(allow_unknown=True)
+        v.validate(file, schema)
+        return v
+
+    def validate(self, snapshot: Snapshot) -> ValidationResult:
+        """Validate a snapshot against a single constraint."""
+        schema: Schema = self.to_schema()
+        validators: Iterable[Validator] = list(
+            map(lambda file: self._validate_file(schema, file), snapshot)
+        )
+        return ValidationResult(
+            status=all(validators),
+            message=None
+            if all(validators)
+            else {
+                file["path"]: validator.errors
+                for file, validator in zip(snapshot, validators)
+            },
+            context=dict(snapshot=snapshot, constraint=self),
+        )
+
+
+@dataclass(frozen=True)
+class RegexConstraint(SchemaConvertibleConstraint):
+    """Constraint for `regex`."""
+
+    val: str
+
+    def to_schema(self) -> Schema:
+        """
+        Convert this constraint to a Cerberus schema that each file in
+        the Snapshot will be validated against.
+        """
+        return {"path": {"type": "string", "required": True, "regex": self.val}}
+
+
+@dataclass(frozen=True)
+class EvalConstraint(Constraint):
+    """Constraint for `eval`."""
+
+    val: str
+
+    @staticmethod
+    def _eval_function(definition: str) -> Tuple[Callable, str]:
+        # Import function definition into locals
+        try:
+            exec(definition)
+        except Exception as e:
+            raise e
+
+        # Parse the function name from the definition
+        match = re.search(r"def (\w+)", definition)
+        if match:
+            function_name = match.group(1)
+        else:
+            raise ValueError(f"Could not parse function name from {definition}")
+        assert function_name in locals()
+        return locals()[function_name], function_name
+
+    def validate(self, snapshot: Snapshot) -> ValidationResult:
+        if not config.allow_eval:
+            raise DJFileValidatorError(
+                "Eval constraint is not allowed. "
+                "Set `Config.allow_eval = True` to allow."
+            )
+        try:
+            function, function_name = self._eval_function(self.val)
+        except Exception as e:
+            raise DJFileValidatorError(
+                f"Error parsing function in `{self.name}` constraint: {type(e).__name__}: {e}"
+            )
+        try:
+            status = function(snapshot)
+        except Exception as e:
+            raise DJFileValidatorError(
+                f"Error validating function `{function_name}` in `{self.name}` constraint: {type(e).__name__}: {e}"
+            )
+        return ValidationResult(
+            status=status,
+            message=None
+            if status
+            else f"constraint `{self.name}` failed: {function_name}(snapshot) returned False",
+            context=dict(snapshot=snapshot, constraint=self),
+        )
+
+
+CONSTRAINT_MAP = {
+    "count_min": CountMinConstraint,
+    "count_max": CountMaxConstraint,
+    "regex": RegexConstraint,
+    "eval": EvalConstraint,
+}
+
+for name, cls in CONSTRAINT_MAP.items():
+    cls._name = name
diff --git a/datajoint_file_validator/error.py b/datajoint_file_validator/error.py
new file mode 100644
index 0000000..fb689d8
--- /dev/null
+++ b/datajoint_file_validator/error.py
@@ -0,0 +1,2 @@
+class DJFileValidatorError(Exception):
+    pass
diff --git a/datajoint_file_validator/main.py b/datajoint_file_validator/main.py
index bbef418..6961701 100644
--- a/datajoint_file_validator/main.py
+++ b/datajoint_file_validator/main.py
@@ -1,31 +1,142 @@
 import yaml
-from cerberus import schema_registry
-from cerberus import rules_set_registry
-
-
-def _example_registry_add():
-    schema_registry.add("non-system user", {"uid": {"min": 1000, "max": 0xFFFF}})
-    schema = {
-        "sender": {"schema": "non-system user", "allow_unknown": True},
-        "receiver": {"schema": "non-system user", "allow_unknown": True},
-    }
-    rules_set_registry.extend(
-        (("boolean", {"type": "boolean"}), ("booleans", {"valuesrules": "boolean"}))
-    )
-    schema = {"foo": "booleans"}
+import cerberus
+from typing import List, Dict, Any, Optional, Union, Tuple
+from .manifest import Manifest, Rule
+from .snapshot import Snapshot, create_snapshot, PathLike
+from .result import ValidationResult
+from .query import DEFAULT_QUERY
+from rich import print as rprint
+from rich.console import Console
+from rich.table import Table
+
+ErrorReport = List[Dict[str, Any]]
+
+
+def validate(
+    target: Union[Snapshot, PathLike],
+    manifest: Union[PathLike, Manifest],
+    verbose=False,
+    raise_err=False,
+    format='table',
+) -> Tuple[bool, ErrorReport]:
+    """
+    Validate a target against a manifest.
+
+    Parameters
+    ----------
+    target : PathLike | Snapshot
+        A path to a file or directory, or an instance of a Snapshot object.
+    manifest : PathLike | Manifest
+        Path to a manifest file, or an instance of a Manifest object.
+    verbose : bool
+        Print verbose output.
+    raise_err : bool
+        Raise an error if validation fails.
+
+    Returns
+    -------
+    result : dict
+        A dictionary with the validation result.
+    """
+    # Infer how to fetch manifest
+    if isinstance(manifest, Manifest):
+        mani = manifest
+    elif isinstance(manifest, str):
+        mani = Manifest.from_yaml(manifest)
+    else:
+        raise ValueError("manifest must be a path or Manifest object.")
+
+    # Infer how to create snapshot
+    if isinstance(target, str):
+        target = create_snapshot(target)
+
+    return validate_snapshot(target, mani, verbose=verbose, raise_err=raise_err, format=format)
 
 
-def _example_schema_from_yaml():
-    schema_text = """
-    name:
-      type: string
-    age:
-      type: integer
-      min: 10
+def table_from_report(report: ErrorReport) -> Table:
     """
-    schema = yaml.safe_load(schema_text)
-    document = {"name": "Little Joe", "age": 5}
-    v.validate(document, schema)
-    # False
-    v.errors
-    # {'age': ['min value is 10']}
+    Format a validation report as a rich table.
+    """
+    columns = [
+        "rule",
+        "rule_description",
+        "constraint_id",
+        "constraint_value",
+        "errors",
+    ]
+    col_names = [
+        "Rule ID",
+        "Rule Description",
+        "Constraint ID",
+        "Constraint Value",
+        "Errors",
+    ]
+    table = Table(*col_names, show_lines=True)
+    for item in report:
+        as_tup = tuple(str(item[col]) for col in columns)
+        table.add_row(*as_tup)
+    return table
+
+
+def validate_snapshot(
+    snapshot: Snapshot,
+    manifest: Manifest,
+    verbose=False,
+    raise_err=False,
+    format="table",
+) -> Tuple[bool, ErrorReport]:
+    """
+    Validate a snapshot against a manifest.
+
+    Parameters
+    ----------
+    snapshot : Snapshot
+        A snapshot dictionary.
+    manifest_path : PathLike
+        Path to a manifest file.
+    verbose : bool
+        Print verbose output.
+    raise_err : bool
+        Raise an error if validation fails.
+
+    Returns
+    -------
+    result : dict
+        A dictionary with the validation result.
+    """
+    results: List[Dict[str, ValidationResult]] = list(
+        map(lambda rule: rule.validate(snapshot), manifest.rules)
+    )
+    success = all(map(lambda result: all(result.values()), results))
+
+    # Generate error report
+    error_report = []
+    for rule, result in zip(manifest.rules, results):
+        for constraint, valresult in result.items():
+            if valresult.status:
+                continue
+            error_report.append(
+                {
+                    "rule": rule.id,
+                    "rule_description": rule.description,
+                    "constraint_id": constraint,
+                    "constraint_value": valresult.context["constraint"].val,
+                    "errors": valresult.message,
+                }
+            )
+    if verbose and not success:
+        rprint("Validation failed with the following errors:")
+        if format == "table":
+            table = table_from_report(error_report)
+            console = Console()
+            console.print(table)
+        elif format == "yaml":
+            rprint(yaml.dump(error_report))
+        elif format == "plain":
+            rprint(error_report)
+        else:
+            raise ValueError(f"Unsupported format: {format}")
+    if raise_err and not success:
+        raise DJFileValidatorError("Validation failed.")
+
+    return success, error_report
diff --git a/datajoint_file_validator/manifest.py b/datajoint_file_validator/manifest.py
index ee7efc1..11eccc8 100644
--- a/datajoint_file_validator/manifest.py
+++ b/datajoint_file_validator/manifest.py
@@ -1,31 +1,51 @@
-from dataclasses import dataclass
-from typing import Dict, List, Any
-from .snapshot import PathLike
-
-Manifest = Any
-
-
-@dataclass
-class Constraint:
-    """A single constraint that evaluates True or False for a fileset."""
-    operator: str
-
-
-@dataclass
-class Rule:
-    """A single rule for a fileset."""
-    name: str
-    description: str
-    root: PathLike
-    constraints: List[Constraint]
-
+from dataclasses import dataclass, field
+from typing import Dict, List, Any, Optional
+import yaml
+from .yaml import read_yaml
+from .error import DJFileValidatorError
+from .result import ValidationResult
+from .snapshot import Snapshot, PathLike, FileMetadata
+from .config import config
+from .rule import Rule
 
 
 @dataclass
 class Manifest:
-    """Manifest for a fileset, defining a fileset type."""
+    """
+    Manifest for a fileset, defining a fileset type.
+    This class is responsible for parsing a manifest file, validating its
+    syntax, and converting into a query and a set of rules.
+    """
 
-    name: str
+    id: str
     version: str
     description: str
-    rules: List[Rule]
+    rules: List[Rule] = field(default_factory=list)
+    uri: Optional[str] = None
+
+    @staticmethod
+    def check_valid(d: Dict) -> bool:
+        """User Cerberus to check if manifest has valid syntax."""
+        raise NotImplementedError()
+
+    @classmethod
+    def from_yaml(cls, path: PathLike, **kw) -> "Manifest":
+        """Load a manifest from a YAML file."""
+        return cls.from_dict(read_yaml(path), **kw)
+
+    @classmethod
+    def from_dict(cls, d: Dict, check_syntax=False) -> "Manifest":
+        """Load a manifest from a dictionary."""
+        if check_syntax:
+            assert cls.check_valid(d)
+        self_ = cls(
+            # TODO: hash by default
+            id=d["id"],
+            uri=d.get("uri"),
+            version=d["version"],
+            description=d["description"],
+            rules=[
+                Rule.from_dict(rule, check_syntax=check_syntax) for rule in d["rules"]
+            ],
+        )
+        return self_
diff --git a/datajoint_file_validator/manifests/demo_bob_lab_frames_v0.1.yaml b/datajoint_file_validator/manifests/demo_bob_lab_frames_v0.1.yaml
index 62c1d72..53115e1 100644
--- a/datajoint_file_validator/manifests/demo_bob_lab_frames_v0.1.yaml
+++ b/datajoint_file_validator/manifests/demo_bob_lab_frames_v0.1.yaml
@@ -1,16 +1,16 @@
-id: https://raw.githubusercontent.com/datajoint/datajoint-file-validator/main/manifests/demo_bob_lab_frames_v0.1
-name: bob_lab_frames
+uri: https://raw.githubusercontent.com/datajoint/datajoint-file-validator/main/manifests/demo_bob_lab_frames_v0.1
+id: bob_lab_frames
 version: 0.1.0
 description: Example of a fileset type for a Bob Lab fileset
 author:
   name: Ethan Ho
   email: ethan@datajoint.com
 rules:
-  - name: num_files_constraint
+  - id: num_files_constraint
     description: Check that there are between 1 and 5 files in the directory
     count_min: 1
     count_max: 5
-  - name: num_files_per_subdir
+  - id: num_files_per_subdir
     description: >
       Check that each subdirectory has between 1 and 100 files
       and that subdirectories only contain .mp4 files.
@@ -18,16 +18,16 @@ rules:
       path: "/*"
       type: directory
     rules:
-      - name: count_per_subdir
+      - id: count_per_subdir
         # Here, the query ("/**") is relative to the sub-directory
         # instead of the root.
         query: "/"
         count_min: 1
         count_max: 100
-      - name: check_file_type
+      - id: check_file_type
         # query: "/**" is implicit here
         regex: "^.*\\.mp4$"
-  - name: file_type_in_subdir
+  - id: file_type_in_subdir
     description: Check that each subdirectory has exactly one obs.md file
     query:
       # Instead of path, regex, or type, we can write a custom query function
diff --git a/datajoint_file_validator/manifests/demo_dlc_v0.1.yaml b/datajoint_file_validator/manifests/demo_dlc_v0.1.yaml
index bf6c258..a95b519 100644
--- a/datajoint_file_validator/manifests/demo_dlc_v0.1.yaml
+++ b/datajoint_file_validator/manifests/demo_dlc_v0.1.yaml
@@ -1,33 +1,30 @@
-id: https://raw.githubusercontent.com/datajoint/datajoint-file-validator/main/manifests/demo_dlc_v0.1
-name: demo_dlc
+uri: https://raw.githubusercontent.com/datajoint/datajoint-file-validator/main/manifests/demo_dlc_v0.1
+id: demo_dlc
 version: 0.1.0
 description: DeepLabCut demo fileset type
 author:
-  name: Ethan Ho
+  id: Ethan Ho
   email: ethan@datajoint.com
 rules:
-  - name: "Min total files"
+  - id: "Min total files"
     description: "Check that there are at least 6 files anywhere in the fileset"
     # This is the default query, which returns every file, even if it is in
     # a subdirectory.
-    query: "/**"
+    query: "**"
     count_min: 6
-  - name: "Count .mp4 files"
-    description: "Check that there are at least 4 .mp4 files and their total size is at least 2.0K"
-    query: "/**/*.mp4"
-    # This rule has two constraints, which both must be satisfied for the rule
-    # to pass.
-    count_min: 4
-    total_size_min: 2.0K
+  - id: "Count .mp4 files"
+    description: "Check that there are at least 2 .mp4 files"
+    query: "**/*.mp4"
+    count_min: 2
 
   # More complex rules below
-  - name: "Only .mp4 and .csv at top level"
+  - id: "Only .mp4 and .csv at top level"
     # This query returns only files at the top level, and will not consider
     # files in subdirectories.
-    query: "/*"
+    query: "*"
     # Note that this regex will not match subdirectores.
     regex: ".*\\.mp4$|.*\\.csv$"
-  - name: "Every video file must have a corresponding csv file"
+  - id: "Every video file must have a corresponding csv file"
     description: "Check that every video file has a corresponding csv file"
     # query: "/**" is implicit here
     # Instead of other constraints, we can use eval to write a custom constraint function.
@@ -36,7 +33,3 @@ rules:
           n_mp4 = len([r for r in results if r['extension'] == 'mp4'])
           n_csv = len([r for r in results if r['extension'] == 'csv'])
           return n_mp4 == n_csv
-  - name: "Size constraints"
-    description: "Check that the size of all files are within a certain range"
-    total_size_min: 2.0K
-    total_size_max: 10000
diff --git a/datajoint_file_validator/path_utils.py b/datajoint_file_validator/path_utils.py
new file mode 100644
index 0000000..8ca5e84
--- /dev/null
+++ b/datajoint_file_validator/path_utils.py
@@ -0,0 +1,23 @@
+from typing import List
+import os.path
+from .snapshot import FileMetadata, Snapshot
+from wcmatch import glob
+
+GLOB_FLAGS = glob.GLOBSTAR | glob.MARK | glob.FOLLOW
+
+
+def find_matching_paths(filenames, patterns, flags=GLOB_FLAGS, **kw):
+    return glob.globfilter(filenames, patterns, flags=flags, **kw)
+
+
+def find_matching_files_gen(snapshot: Snapshot, patterns):
+    filenames = [file.get("path") for file in snapshot]
+    return (
+        file
+        for file in snapshot
+        if file.get("path") in set(find_matching_paths(filenames, patterns))
+    )
+
+
+def find_matching_files(snapshot: Snapshot, patterns):
+    return list(find_matching_files_gen(snapshot, patterns))
diff --git a/datajoint_file_validator/query.py b/datajoint_file_validator/query.py
new file mode 100644
index 0000000..41dbea9
--- /dev/null
+++ b/datajoint_file_validator/query.py
@@ -0,0 +1,31 @@
+import os
+from dataclasses import dataclass
+from pathlib import PurePath
+from .snapshot import Snapshot, PathLike
+from .path_utils import find_matching_files
+
+DEFAULT_QUERY = "**"
+
+
+@dataclass(frozen=True)
+class Query:
+    """An object representing a query against a snapshot."""
+
+    def filter(self, snapshot: Snapshot) -> Snapshot:
+        """Filter a Snapshot based on this query. Virtual method."""
+        raise NotImplementedError("Subclass of Query must implement filter() method.")
+
+
+@dataclass(frozen=True)
+class GlobQuery(Query):
+    """A query that filters based on path. Includes support for glob wildcards."""
+
+    path: str = DEFAULT_QUERY
+
+    def filter(self, snapshot: Snapshot) -> Snapshot:
+        """Filter a Snapshot based on this query."""
+        return list(self._filter_generator(snapshot))
+
+    def _filter_generator(self, snapshot: Snapshot):
+        """Filter a Snapshot based on this query. Returns a generator."""
+        return find_matching_files(snapshot, self.path)
diff --git a/datajoint_file_validator/result.py b/datajoint_file_validator/result.py
index 686a2f1..8d94f55 100644
--- a/datajoint_file_validator/result.py
+++ b/datajoint_file_validator/result.py
@@ -1,13 +1,21 @@
-from dataclasses import dataclass
-from typing import Dict, Any
+from dataclasses import dataclass, field
+from typing import Dict, Any, Optional
 import cerberus
 
 
 @dataclass
 class ValidationResult:
     status: bool
-    errors: Any
+    # TODO
+    message: Any
+    context: Optional[Dict[str, Any]] = field(default_factory=dict)
 
     @classmethod
     def from_validator(cls, v: cerberus.Validator):
         return cls(status=v.status, errors=v.errors)
+
+    def __repr__(self):
+        return f"ValidationResult(status={self.status}, message={self.message})"
+
+    def __bool__(self) -> bool:
+        return self.status
diff --git a/datajoint_file_validator/rule.py b/datajoint_file_validator/rule.py
new file mode 100644
index 0000000..5681e95
--- /dev/null
+++ b/datajoint_file_validator/rule.py
@@ -0,0 +1,74 @@
+from dataclasses import dataclass, field
+import hashlib
+from typing import Dict, List, Any, Optional
+from .constraint import Constraint, CONSTRAINT_MAP
+from .result import ValidationResult
+from .snapshot import Snapshot, PathLike, FileMetadata
+from .query import Query, GlobQuery, DEFAULT_QUERY
+from .config import config
+from .error import DJFileValidatorError
+
+
+@dataclass
+class Rule:
+    """A single rule for a fileset."""
+
+    id: Optional[str]
+    description: Optional[str]
+    constraints: List[Constraint] = field(default_factory=list)
+    query: Query = field(default_factory=GlobQuery)
+
+    def __post_init__(self):
+        if not self.id:
+            self.id = self._generate_id()
+
+    def _generate_id(self) -> str:
+        return hashlib.sha1(hex(hash(self)).encode("utf-8")).hexdigest()[:7]
+
+    def __hash__(self):
+        return hash((self.query, tuple(self.constraints)))
+
+    def validate(self, snapshot: Snapshot) -> Dict[str, ValidationResult]:
+        filtered_snapshot: Snapshot = self.query.filter(snapshot)
+        if self.query.path == DEFAULT_QUERY and config.debug:
+            assert filtered_snapshot == snapshot
+        results = list(
+            map(lambda constraint: constraint.validate(filtered_snapshot), self.constraints)
+        )
+        return {
+            constraint.name: result
+            for constraint, result in zip(self.constraints, results)
+        }
+
+    @staticmethod
+    def compile_query(raw: Any) -> "Query":
+        assert isinstance(raw, str)
+        return GlobQuery(path=raw)
+
+    @staticmethod
+    def compile_constraint(name: str, val: Any) -> "Constraint":
+        if name not in CONSTRAINT_MAP:
+            raise DJFileValidatorError(f"Unknown constraint: {name}")
+        try:
+            return CONSTRAINT_MAP[name](val)
+        except DJFileValidatorError as e:
+            raise DJFileValidatorError(f"Error parsing constraint {name}: {e}")
+
+    @classmethod
+    def from_dict(cls, d: Dict, check_syntax=False) -> "Rule":
+        """Load a rule from a dictionary."""
+        if check_syntax:
+            assert cls.check_valid(d)
+        id = d.pop("id", None)
+        try:
+            self_ = cls(
+                id=id,
+                description=d.pop("description", None),
+                query=cls.compile_query(d.pop("query", DEFAULT_QUERY)),
+                constraints=[
+                    cls.compile_constraint(name, val) for name, val in d.items()
+                ],
+            )
+        except DJFileValidatorError as e:
+            raise DJFileValidatorError(f"Error parsing rule '{id}': {e}")
+        return self_
diff --git a/datajoint_file_validator/snapshot.py b/datajoint_file_validator/snapshot.py
index c246db0..4cc7bf3 100644
--- a/datajoint_file_validator/snapshot.py
+++ b/datajoint_file_validator/snapshot.py
@@ -2,7 +2,8 @@
 from datetime import datetime
 import pytz
 from dataclasses import dataclass, field, asdict
-from pathlib import Path
+from wcmatch import pathlib
+from wcmatch.pathlib import Path
 from typing import List, Dict, Any, Optional, Union
 
 ENABLE_PATH_HANDLE = True
@@ -10,11 +11,15 @@
 
 @dataclass
 class FileMetadata:
-    """Metadata for a file."""
+    """
+    Metadata for a file.
+    """
 
     name: str
-    path: str
+    path: str = field(init=False)
     abs_path: str
+    rel_path: str
+    extension: str
     size: int
     type: str
     last_modified: str
@@ -24,8 +29,7 @@ class FileMetadata:
     _path: Optional[Path] = field(default=None, repr=False)
 
     def __post_init__(self):
-        # self.id = f'{self.phrase}_{self.word_type.name.lower()}'
-        pass
+        self.path = self.rel_path
 
     @staticmethod
     def to_iso_8601(time_ns: int):
@@ -33,15 +37,16 @@ def to_iso_8601(time_ns: int):
         return time_.replace(tzinfo=pytz.UTC).isoformat()
 
     @classmethod
-    def from_path(cls, path: Path) -> "FileMetadata":
+    def from_path(cls, path: Path, root: Path) -> "FileMetadata":
         """Return a FileMetadata object from a Path object."""
         return cls(
             name=path.name,
-            path=str(path.relative_to(path.parent)),
+            rel_path=str(path.relative_to(root)),
             abs_path=str(path),
             size=path.stat().st_size,
             type="file" if path.is_file() else "directory",
             last_modified=cls.to_iso_8601(path.stat().st_mtime_ns),
+            extension=path.suffix,
             mtime_ns=path.stat().st_mtime_ns,
             ctime_ns=path.stat().st_ctime_ns,
             atime_ns=path.stat().st_atime_ns,
@@ -49,7 +54,7 @@ def from_path(cls, path: Path) -> "FileMetadata":
         )
 
     def __repr__(self):
-        return f"{self.__class__.__name__}(path={self.path!r})"
+        return f"{self.__class__.__name__}(path={self.path!r}, type={self.type!r})"
 
     @staticmethod
     def dict_factory(x):
@@ -66,18 +71,20 @@ def asdict(self):
 Snapshot = List[Dict[str, Any]]
 
 
-def _snapshot_to_cls(path: str) -> List[FileMetadata]:
+def _snapshot_to_cls(
+    path: str, flags=(pathlib.GLOBSTAR | pathlib.SPLIT | pathlib.FOLLOW)
+) -> List[FileMetadata]:
     """Generate a snapshot of a file or directory at local `path`."""
     root = Path(path)
     if root.is_file():
         files = [FileMetadata.from_path(root)]
     elif root.is_dir():
-        files = [FileMetadata.from_path(p) for p in root.glob("**/*")]
+        files = [FileMetadata.from_path(p, root) for p in root.glob("**", flags=flags)]
     else:
         raise ValueError(f"path {path} is not a file or directory")
     return files
 
 
-def snapshot(path: str) -> Snapshot:
+def create_snapshot(path: str) -> Snapshot:
     files = _snapshot_to_cls(path)
     return [f.asdict() for f in files]
diff --git a/datajoint_file_validator/validate.py b/datajoint_file_validator/validate.py
deleted file mode 100644
index 0f41885..0000000
--- a/datajoint_file_validator/validate.py
+++ /dev/null
@@ -1,63 +0,0 @@
-import yaml
-import cerberus
-from typing import Dict
-from .manifest import Manifest
-from .snapshot import Snapshot, snapshot, PathLike
-from .result import ValidationResult
-
-
-def validate_snapshot(
-    snapshot: Snapshot, manifest: Manifest, verbose=False, raise_err=False
-) -> ValidationResult:
-    """
-    Validate a snapshot against a manifest.
-
-    Parameters
-    ----------
-    snapshot : Snapshot
-            A snapshot dictionary.
-    manifest : Manifest
-            Contents of a manifest file.
-    verbose : bool
-            Print verbose output.
-    raise_err : bool
-            Raise an error if validation fails.
-
-    Returns
-    -------
-    result : dict
-            A dictionary with the validation result.
-    """
-    # Convert manifest to Cerberus schema
-    raise NotImplementedError()
-    # Validate snapshot against schema using Cerberus
-    v = cerberus.Validator(schema)
-    v.validate(snapshot)
-    result = ValidationResult.from_validator(v)
-    return result
-
-
-def validate_path(
-    path: PathLike, manifest: Manifest, verbose=False, raise_err=False
-) -> ValidationResult:
-    """
-    Validate a path against a manifest.
-
-    Parameters
-    ----------
-    path : PathLike
-            A path to a file or directory.
-    manifest : Manifest
-            Path to a manifest file.
-    verbose : bool
-            Print verbose output.
-    raise_err : bool
-            Raise an error if validation fails.
-
-    Returns
-    -------
-    result : ValidationResult
-            A dictionary with the validation result.
-    """
-    snapshot = snapshot(path)
-    return validate(snapshot, manifest, verbose=verbose, raise_err=raise_err)
diff --git a/datajoint_file_validator/yaml.py b/datajoint_file_validator/yaml.py
new file mode 100644
index 0000000..256b079
--- /dev/null
+++ b/datajoint_file_validator/yaml.py
@@ -0,0 +1,9 @@
+import yaml
+from typing import Any
+from .snapshot import PathLike
+
+
+def read_yaml(path: PathLike) -> Any:
+    """Read a YAML file from `path`."""
+    with open(path, "r") as f:
+        return yaml.safe_load(f)
diff --git a/poetry.lock b/poetry.lock
index fdd75a3..93b7978 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,5 +1,16 @@
 # This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
+[[package]]
+name = "bracex"
+version = "2.4"
+description = "Bash style brace expander."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "bracex-2.4-py3-none-any.whl", hash = "sha256:efdc71eff95eaff5e0f8cfebe7d01adf2c8637c8c92edaf63ef348c241a82418"},
+    {file = "bracex-2.4.tar.gz", hash = "sha256:a27eaf1df42cf561fed58b7a8f3fdf129d1ea16a81e1fadd1d17989bc6384beb"},
+]
+
 [[package]]
 name = "cerberus"
 version = "1.3.5"
@@ -334,7 +345,21 @@ files = [
     {file = "typing_extensions-4.8.0.tar.gz", hash = "sha256:df8e4339e9cb77357558cbdbceca33c303714cf861d1eef15e1070055ae8b7ef"},
 ]
 
+[[package]]
+name = "wcmatch"
+version = "8.5"
+description = "Wildcard/glob file name matcher."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "wcmatch-8.5-py3-none-any.whl", hash = "sha256:14554e409b142edeefab901dc68ad570b30a72a8ab9a79106c5d5e9a6d241bd5"},
+    {file = "wcmatch-8.5.tar.gz", hash = "sha256:86c17572d0f75cbf3bcb1a18f3bf2f9e72b39a9c08c9b4a74e991e1882a8efb3"},
+]
+
+[package.dependencies]
+bracex = ">=2.1.1"
+
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8"
-content-hash = "d2af8bcdcf8de42c40221fe5a76803f54947957e01901d8007da09577258be6f"
+content-hash = "de40b7fb81d03a274ce9f388d3d19adfcfa33b7e673ec866af2b1cea07564b00"
diff --git a/pyproject.toml b/pyproject.toml
index 97957e3..9b50797 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ cerberus = "^1.3.5"
 typer = {version = "^0.9.0", extras = ["all"]}
 pyyaml = "^6.0.1"
 pytz = "^2023.3.post1"
+wcmatch = "^8.5"
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.0.1"
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..5871ed8
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1 @@
+import pytest
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rename to tests/data/filesets/fileset1/2021-10-02/foo/bar.txt
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diff --git a/tests/data/filesets/fileset1/2021-10-01/subject0_frame1.png b/tests/data/filesets/fileset1/README.txt
similarity index 100%
rename from tests/data/filesets/fileset1/2021-10-01/subject0_frame1.png
rename to tests/data/filesets/fileset1/README.txt
diff --git a/tests/data/filesets/fileset1/2021-10-01/subject0_frame10.png b/tests/data/filesets/fileset1/obs.md
similarity index 100%
rename from tests/data/filesets/fileset1/2021-10-01/subject0_frame10.png
rename to tests/data/filesets/fileset1/obs.md
diff --git a/tests/test_fileset_validate.py b/tests/test_fileset_validate.py
index acbced9..597fdef 100644
--- a/tests/test_fileset_validate.py
+++ b/tests/test_fileset_validate.py
@@ -4,17 +4,65 @@
 
 
 @pytest.mark.parametrize(
-    "manifest_path,fileset_path",
-    (
-        (
-            "datajoint_file_validator/manifests/demo_dlc_v0.1.demo_dlc_v0.1.yaml",
-            "tests/data/filesets/fileset0",
-        ),
-    ),
+    "manifest_path",
+    ("datajoint_file_validator/manifests/demo_dlc_v0.1.yaml",),
 )
-def test_validate_built_in_filesets(manifest_path, fileset_path):
-    snapshot = djfval.snapshot.snapshot(fileset_path)
-    result = djfval.validate.validate_snapshot(
-        snapshot=snapshot, manifest=manifest_path, verbose=True, raise_err=False
+def test_parse_manifest_from_yaml(manifest_path):
+    assert isinstance(manifest_path, str)
+    mani = djfval.manifest.Manifest.from_yaml(manifest_path)
+    assert isinstance(mani, djfval.manifest.Manifest)
+
+
+def test_validate_fileset0():
+    success, report = djfval.validate(
+        "tests/data/filesets/fileset0",
+        "datajoint_file_validator/manifests/demo_dlc_v0.1.yaml",
+        verbose=True,
+        raise_err=False,
+    )
+    failed_constraints = [item["constraint_id"] for item in report]
+    assert not success
+    assert isinstance(report, list)
+    assert failed_constraints == ["count_min"]
+
+
+def test_validate_fileset1():
+    manifest = djfval.Manifest.from_dict(
+        {
+            "id": "test",
+            "version": "0.1",
+            "description": "Test manifest",
+            "rules": [
+                {
+                    "id": "count_min_max",
+                    "description": "Check count min max",
+                    "query": "**",
+                    "count_min": 20,
+                },
+                {
+                    # id automatically generated from hash of constraints
+                    "count_max": 3,
+                },
+                {
+                    "id": "max_txt_files",
+                    "query": "*.txt",
+                    "count_max": 5,
+                },
+                {
+                    "eval": "def test_custom(snapshot):\n    return False",
+                },
+            ],
+        }
+    )
+    success, report = djfval.validate(
+        "tests/data/filesets/fileset1",
+        manifest,
+        verbose=True,
+        raise_err=False,
     )
-    assert result["status"]
+    failed_constraints = [item["constraint_id"] for item in report]
+    failed_rules = [item["rule"] for item in report]
+    assert not success
+    assert isinstance(report, list)
+    assert "count_max" in failed_constraints
+    assert "max_txt_files" not in failed_rules
diff --git a/tests/test_path_utils.py b/tests/test_path_utils.py
new file mode 100644
index 0000000..0a2889d
--- /dev/null
+++ b/tests/test_path_utils.py
@@ -0,0 +1,86 @@
+import os
+import pytest
+from datajoint_file_validator.path_utils import find_matching_paths
+
+
+@pytest.fixture
+def example0_paths():
+    """
+    flags = (glob.GLOBSTAR | glob.K | glob.X)
+    glob.glob('**', flags=flags)
+    """
+    return set(
+        [
+            "2021-10-02/",
+            "2021-10-02/subject1_frame1.png",
+            "2021-10-02/subject1_frame2.png",
+            "2021-10-02/obs.md",
+            "2021-10-02/subject1_frame3.png",
+            "2021-10-02/subject1_frame7.png",
+            "2021-10-02/subject1_frame0.png",
+            "2021-10-02/foo/",
+            "2021-10-02/foo/bar.txt",
+            "2021-10-02/subject1_frame4.png",
+            "2021-10-02/subject1_frame6.png",
+            "2021-10-02/subject1_frame5.png",
+            "obs.md",
+            "2021-10-01/",
+            "2021-10-01/subject1_frame1.png",
+            "2021-10-01/subject1_frame2.png",
+            "2021-10-01/obs.txt",
+            "2021-10-01/subject1_frame3.png",
+            "2021-10-01/subject1_frame0.png",
+            "2021-10-01/subject1_frame4.png",
+            "2021-10-01/subject1_frame5.png",
+            "README.txt",
+        ]
+    )
+
+
+def test_example0_paths(example0_paths):
+    assert set(find_matching_paths(example0_paths, "**")) == example0_paths
+    assert set(find_matching_paths(example0_paths, ["**"])) == example0_paths
+    assert not set(find_matching_paths(example0_paths, "./**"))
+    assert not set(find_matching_paths(example0_paths, "./*"))
+
+    assert set(find_matching_paths(example0_paths, "**/*.md")) == {
+        "obs.md",
+        "2021-10-02/obs.md",
+    }
+    assert not set(find_matching_paths(example0_paths, "./**.md"))
+    assert set(find_matching_paths(example0_paths, "**/*.txt")) == {
+        "2021-10-01/obs.txt",
+        "2021-10-02/foo/bar.txt",
+        "README.txt",
+    }
+    assert set(find_matching_paths(example0_paths, "*/*/*.txt")) == {
+        "2021-10-02/foo/bar.txt",
+    }
+    assert set(find_matching_paths(example0_paths, "*/**/*.txt")) == {
+        "2021-10-01/obs.txt",
+        "2021-10-02/foo/bar.txt",
+    }
+
+    assert set(
+        find_matching_paths(example0_paths, "2021-10-0*/subject1_frame*.png")
+    ) == {
+        "2021-10-01/subject1_frame0.png",
+        "2021-10-01/subject1_frame1.png",
+        "2021-10-01/subject1_frame2.png",
+        "2021-10-01/subject1_frame3.png",
+        "2021-10-01/subject1_frame4.png",
+        "2021-10-01/subject1_frame5.png",
+        "2021-10-02/subject1_frame0.png",
+        "2021-10-02/subject1_frame1.png",
+        "2021-10-02/subject1_frame2.png",
+        "2021-10-02/subject1_frame3.png",
+        "2021-10-02/subject1_frame4.png",
+        "2021-10-02/subject1_frame5.png",
+        "2021-10-02/subject1_frame6.png",
+        "2021-10-02/subject1_frame7.png",
+    }
+
+    assert set(find_matching_paths(example0_paths, "*/")) == {
+        "2021-10-01/",
+        "2021-10-02/",
+    }
diff --git a/tests/test_query.py b/tests/test_query.py
new file mode 100644
index 0000000..5884119
--- /dev/null
+++ b/tests/test_query.py
@@ -0,0 +1,53 @@
+import pytest
+import datajoint_file_validator as djfval
+
+
+class TestGlobQuery:
+    def _glob_query(self, pattern, ss):
+        filtered_snapshot = djfval.query.GlobQuery(pattern).filter(ss)
+        return [item["path"] for item in filtered_snapshot]
+
+    def test_glob_query(self):
+        fileset_path = "tests/data/filesets/fileset1"
+        ss = djfval.snapshot.create_snapshot(fileset_path)
+        ss_paths = [item["path"] for item in ss]
+
+        assert set(self._glob_query("**", ss)) == set(ss_paths)
+        assert self._glob_query("2021-10-02", ss) == ["2021-10-02"]
+        assert set(self._glob_query("2021-10-02/*", ss)) == set(
+            [
+                "2021-10-02/subject1_frame1.png",
+                "2021-10-02/subject1_frame2.png",
+                "2021-10-02/obs.md",
+                "2021-10-02/subject1_frame3.png",
+                "2021-10-02/subject1_frame7.png",
+                "2021-10-02/subject1_frame0.png",
+                "2021-10-02/foo",
+                "2021-10-02/subject1_frame4.png",
+                "2021-10-02/subject1_frame6.png",
+                "2021-10-02/subject1_frame5.png",
+            ]
+        )
+        assert set(self._glob_query("2021-10-02/**", ss)) == set(
+            [
+                "2021-10-02/subject1_frame1.png",
+                "2021-10-02/subject1_frame2.png",
+                "2021-10-02/obs.md",
+                "2021-10-02/subject1_frame3.png",
+                "2021-10-02/subject1_frame7.png",
+                "2021-10-02/subject1_frame0.png",
+                "2021-10-02/foo",
+                "2021-10-02/foo/bar.txt",
+                "2021-10-02/subject1_frame4.png",
+                "2021-10-02/subject1_frame6.png",
+                "2021-10-02/subject1_frame5.png",
+            ]
+        )
+        assert set(self._glob_query("**/*.txt", ss)) == set(
+            ["2021-10-02/foo/bar.txt", "2021-10-01/obs.txt", "README.txt"]
+        )
+        assert set(self._glob_query("*.txt", ss)) == set(["README.txt"])
+        assert set(self._glob_query("*/**/*.txt", ss)) == set(
+            ["2021-10-02/foo/bar.txt", "2021-10-01/obs.txt"]
+        )
+        assert set(self._glob_query("*/*.txt", ss)) == set(["2021-10-01/obs.txt"])
\ No newline at end of file
diff --git a/tests/test_snapshot.py b/tests/test_snapshot.py
index 2cd97c4..e63b4e2 100644
--- a/tests/test_snapshot.py
+++ b/tests/test_snapshot.py
@@ -4,16 +4,36 @@
 import datajoint_file_validator as djfval
 
 
-@pytest.mark.parametrize(
-    "fileset_path",
-    (
-        "tests/data/filesets/fileset0",
-        "tests/data/filesets/fileset0/2021-10-01_poses.csv",
-    ),
-)
-def test_can_snapshot_to_cls(fileset_path):
-    snapshot = djfval.snapshot._snapshot_to_cls(fileset_path)
-    assert isinstance(snapshot, list)
-    for item in snapshot:
-        assert isinstance(item, djfval.snapshot.FileMetadata)
-    dicts = [item.asdict() for item in snapshot]
+def test_snapshot_fileset1():
+    fileset_path = "tests/data/filesets/fileset1"
+    files = djfval.snapshot.create_snapshot(fileset_path)
+    assert isinstance(files, list)
+    for item in files:
+        assert isinstance(item, dict)
+    paths = [item["path"] for item in files]
+    assert set(paths) == set(
+        [
+            "2021-10-02",
+            "2021-10-02/subject1_frame1.png",
+            "2021-10-02/subject1_frame2.png",
+            "2021-10-02/obs.md",
+            "2021-10-02/subject1_frame3.png",
+            "2021-10-02/subject1_frame7.png",
+            "2021-10-02/subject1_frame0.png",
+            "2021-10-02/foo",
+            "2021-10-02/foo/bar.txt",
+            "2021-10-02/subject1_frame4.png",
+            "2021-10-02/subject1_frame6.png",
+            "2021-10-02/subject1_frame5.png",
+            "obs.md",
+            "2021-10-01",
+            "2021-10-01/subject1_frame1.png",
+            "2021-10-01/subject1_frame2.png",
+            "2021-10-01/obs.txt",
+            "2021-10-01/subject1_frame3.png",
+            "2021-10-01/subject1_frame0.png",
+            "2021-10-01/subject1_frame4.png",
+            "2021-10-01/subject1_frame5.png",
+            "README.txt",
+        ]
+    )