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feat: add templates_to_graph exposing templates as RDF #53

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feat: add templates_to_graph exposing templates as RDF #53

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ab31b10
Update fenix for latest rust toolchain in Nix flake
thenonameguy May 31, 2026
f03e859
Add templates_to_graph to serialize OTTR templates as RDF
thenonameguy May 31, 2026
caccd28
Expose get_templates and templates_to_graph in Python
thenonameguy May 31, 2026
df94fb9
Improve Python templates_to_graph testing
thenonameguy May 31, 2026
f0ab6e9
Implement relation SHACL inference in the test
thenonameguy May 31, 2026
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8 changes: 4 additions & 4 deletions flake.lock
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2 changes: 1 addition & 1 deletion flake.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@

crane.url = "github:ipetkov/crane";

fenix.url = "github:nix-community/fenix/80b1a19a713e2558c411f3259fecb1edd4b5b327";
fenix.url = "github:nix-community/fenix/380f1969f440e683333af5746caac76811b4a1a8";
fenix.inputs.nixpkgs.follows = "nixpkgs";
};

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25 changes: 24 additions & 1 deletion lib/maplib/src/model.rs
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Expand Up @@ -20,6 +20,7 @@ use std::fs;
use std::io::Write;
use std::path::Path;
use std::sync::Arc;
use templates::as_rdf::templates_to_triples;
use templates::ast::{ConstantTermOrList, PType, Template};
use templates::dataset::TemplateDataset;
use templates::document::document_from_str;
Expand All @@ -30,7 +31,7 @@ use triplestore::{IndexingOptions, NewTriples, Triplestore};

use chrontext::engine::{ChrontextSettings, Engine};
use datalog::ast::DatalogRuleset;
use representation::constants::{FX_PREFIX, FX_PREFIX_IRI, XYZ_PREFIX, XYZ_PREFIX_IRI};
use representation::constants::{FX_PREFIX, FX_PREFIX_IRI, OTTR_TRIPLE, XYZ_PREFIX, XYZ_PREFIX_IRI};
use representation::dataset::NamedGraph;
use representation::prefixes::get_default_prefixes;
use tracing::instrument;
Expand Down Expand Up @@ -338,6 +339,28 @@ impl Model {
.map_err(MaplibError::TriplestoreError)
}

/// The templates held by this model, excluding the built-in `ottr:Triple` primitive that
/// `TemplateDataset` injects as the base case every template expands to.
pub fn get_templates(&self) -> Vec<&Template> {
self.template_dataset
.templates
.iter()
.filter(|t| t.signature.iri.as_str() != OTTR_TRIPLE)
.collect()
}

/// Materialize the model's OTTR templates into `graph` as RDF using the flattened maplib
/// template vocabulary (prefix `mtpl`). Triples are added alongside any existing content of
/// the graph.
#[instrument(skip_all)]
pub fn templates_to_graph(&mut self, graph: &NamedGraph) -> Result<(), MaplibError> {
let triples = templates_to_triples(&self.template_dataset.templates);
self.triplestore
.add_triples(triples, graph, false)
.map_err(MaplibError::TriplestoreError)?;
Ok(())
}

#[instrument(skip_all)]
pub fn query(
&mut self,
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4 changes: 4 additions & 0 deletions lib/representation/src/constants.rs
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Expand Up @@ -20,6 +20,10 @@ pub const DEFAULT_PREFIX_IRI: &str = "urn:maplib_default:";
pub const OTTR_IRI: &str = "http://ns.ottr.xyz/0.4/IRI";
pub const OTTR_BLANK_NODE: &str = "http://ns.ottr.xyz/0.4/BlankNode";

// Flattened maplib vocabulary used to expose OTTR templates as a queryable named graph.
pub const MAPLIB_TEMPLATE_PREFIX: &str = "mtpl";
pub const MAPLIB_TEMPLATE_PREFIX_IRI: &str = "https://datatreehouse.github.io/maplib/vocab#";

pub const OWL_PREFIX: &str = "owl";
pub const OWL_PREFIX_IRI: &str = "http://www.w3.org/2002/07/owl#";

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8 changes: 5 additions & 3 deletions lib/representation/src/prefixes.rs
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@@ -1,7 +1,8 @@
use crate::constants::{
DEFAULT_PREFIX, DEFAULT_PREFIX_IRI, FOAF_PREFIX, FOAF_PREFIX_IRI, OTTR_PREFIX, OTTR_PREFIX_IRI,
OWL_PREFIX, OWL_PREFIX_IRI, RDFS_PREFIX, RDFS_PREFIX_IRI, RDF_PREFIX, RDF_PREFIX_IRI,
SHACL_PREFIX, SHACL_PREFIX_IRI, XSD_PREFIX, XSD_PREFIX_IRI,
DEFAULT_PREFIX, DEFAULT_PREFIX_IRI, FOAF_PREFIX, FOAF_PREFIX_IRI, MAPLIB_TEMPLATE_PREFIX,
MAPLIB_TEMPLATE_PREFIX_IRI, OTTR_PREFIX, OTTR_PREFIX_IRI, OWL_PREFIX, OWL_PREFIX_IRI,
RDFS_PREFIX, RDFS_PREFIX_IRI, RDF_PREFIX, RDF_PREFIX_IRI, SHACL_PREFIX, SHACL_PREFIX_IRI,
XSD_PREFIX, XSD_PREFIX_IRI,
};
use oxrdf::NamedNode;
use std::collections::HashMap;
Expand All @@ -16,6 +17,7 @@ pub fn get_default_prefixes() -> HashMap<String, NamedNode> {
(SHACL_PREFIX, SHACL_PREFIX_IRI),
(DEFAULT_PREFIX, DEFAULT_PREFIX_IRI),
(FOAF_PREFIX, FOAF_PREFIX_IRI),
(MAPLIB_TEMPLATE_PREFIX, MAPLIB_TEMPLATE_PREFIX_IRI),
];
HashMap::from_iter(
predefined
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