daf-semantics

The Daf Semantics repository collects some different components, designed for integrating ontologies, RDF data and to provide some different "semantic" functionalities to the DAF platform.

The architecture is internally splitted into some different microservices:

We can thus recognize 4 different areas:

• catalog frontend

  • DAF dataportal is the DAF front-end, where all the datasets are available. It includes a section with information about ontologies/vocabularies, and a page for validating metadata, using a standard validator.
  • katalod [WIP] is the backend for the "catalog" frontend: it exposes some different endpoints to DAF dataportal, designed ad hoc to provide a conventional data and metadata access from the ontologies and controlled vocabularies from the OntoPiA network.
  • semantic_frontend mockup was designed as a first guideline for developing an ontologies/vocabularies catalog front-end
  • OntoPiA-UI a docker image, containing a collection of tools useful for exploring the OntoPiA network of ontologies.

• standardized data ingestion into DAF:

  • ontonethub a component providing indexing/search capabilities for the catalog. The microservice offers a convetional way for annotating incoming datasets.
  • semantic_standardization [POC] a component designed to support a simple normalization of values inside datasets, using the controlled values defined inside the vocabularies of the OntoPiA network.

• RDF / linked data and triplestore

  • kbaselib [WIP] a library collecting several different functionalities, shared between other components. It can be used by its own, providing a simple abstraction over a triplestore, using the standard RDF4J interface.
  • [semantic mapping / triplifier] [WIP] a component for mapping of incoming data (typically from JDBC, or CSV) to RDF, using W3C standards
  • The semantic_manager was designed as the central access point for a subset of emerging use case, and for loading data in both semantic_repository and ontonethub components. The microservice acts more or less as an internal API gateway, and its revision is currently planned.
  • semantic_repository an abstraction over different triplestores (for example: in-memory, virtuoso).

• metadata validation and production

  • semantic_validator [WIP] a component for validating an ontology over DCAT-AP_IT standard
  • semantic_spreadsheet a repository collecting recipes for creating RDF data from spreadsheets, using google refine

OntoPiA The ontologies / controlled-vocabularies network