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-# emc-rdf
-EMC driver for RDF graphs
+# RDF driver for Epsilon
+
+This is a prototype of an [Epsilon Model Connectivity](https://eclipse.dev/epsilon/doc/emc/) driver for RDF and related technologies, based on [Apache Jena](https://jena.apache.org/).
+
+## Features and limitations
+
+Currently, the driver can:
+
+* Read and query one or more RDF documents in the formats supported by Jena (Turtle and RDF/XML have been tested).
+
+For now, the driver has these limitations:
+
+* Does *not* support modifying or saving RDF documents.
+* Does *not* integrate the OWL or RDFS support in Jena.
+
+## Installation and examples
+
+Install the features from this update site into your Eclipse IDE:
+
+https://epsilonlabs.github.io/emc-rdf/updates/
+
+Example projects are available from the [`examples`](./examples) folder of this repository.
+
+## Features
+
+This is a high-level description of the features of the driver.
+The features are described using examples based on the [W3C RDF 1.2 Turtle](https://www.w3.org/TR/rdf12-turtle/#sec-intro) example:
+
+```
+BASE <http://example.org/>
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX foaf: <http://xmlns.com/foaf/0.1/>
+PREFIX rel: <http://www.perceive.net/schemas/relationship/>
+
+<#green-goblin>
+  rel:enemyOf <#spiderman> ;
+  a foaf:Person ;    # in the context of the Marvel universe
+  foaf:name "Green Goblin" .
+
+<#spiderman>
+  rel:enemyOf <#green-goblin> ;
+  a foaf:Person ;
+  foaf:name "Spiderman", "Человек-паук"@ru .
+```
+
+### Accessing model elements
+
+To obtain a specific RDF resource by its URL:
+
+```
+var goblin = Model.getElementById('http://example.org/#green-goblin');
+```
+
+To list all the resources that have an `rdf:type` predicate with a certain object acting as their type, use `Type.all`:
+
+```
+`foaf:Person`.all.println('All people: ');
+```
+
+Note the above use of `foaf:Person`, using both the prefix and the local name, and the use of backticks to escape the name.
+If there is no risk of ambiguity, you can just use the local name:
+
+```
+Person.all.println('All people: ');
+```
+
+By default, the prefixes are read from the documents, but you can also specify custom prefixes while loading the model.
+
+### Accessing predicates
+
+Using `resource.p`, you can access all the objects of the `p` predicate where `resource` is the subject.
+For example:
+
+```
+goblin.`rel:enemyOf`.println('Enemies of the Green Goblin: ');
+```
+
+Note that currently `resource.p` will always return a collection, as we do not leverage yet the RDFS descriptions that could indicate the cardinality of `p`.
+
+If there is no risk of ambiguity, you can also drop the prefix:
+
+```
+goblin.enemyOf.println('Enemies of the Green Goblin: ');
+```
+
+If there are predicates with the same local name but different namespace URIs in the graph formed by all the loaded documents in a model, a warning will be issued.
+In this case, you should be using a prefix to avoid the ambiguity.
+
+It is possible to mention a language suffix, to limit the results to literals with that language.
+For instance:
+
+```
+var spider = Model.getElementById('http://example.org/#spiderman');
+spider.`name@ru`.println('Name of Spiderman in Russian: ');
+```