Added examples

Author: RinkeHoekstra

examples/README.md

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+The examples in this folder are:
+
+* [`shacl_example.ttl`](shacl_example.ttl) is a sample Turtle file for testing SHACL constraints.
+* [`shacl_example_shapes.ttl`](shacl_example_shapes.ttl) holds SHACL constraints for validating [`shacl_example.ttl`](shacl_example.ttl). Note that the [`shacl_example.ttl`](shacl_example.ttl) file refers to this shapes file. This is not required, but avoids having to select the shapes file from a file open window.
+* [`shacl_example.rq`](shacl_example.rq) is a very simple SPARQL query to query the [`shacl_example.ttl`](shacl_example.ttl) file. Note that the SPARQL query refers to the file it is intended to query. This is not required, but avoids having to select the data file from a file open window.
+* [`test.jsonld`](test.jsonld) is an example JSON-LD file that can be used for testing format conversion and JSON-LD manipulation.
+* [`test_frame.jsonld`](test_frame.jsonld) is an example JSON-LD frame for framing the [`test.jsonld`](test.jsonld) file.

examples/shacl_example.rq

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+# file: shacl_example.ttl
+SELECT * WHERE  {
+    ?a ?b ?c .
+}

examples/shacl_example.ttl

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+# shapes: shacl_example_shapes.ttl
+@prefix ex: <https://example.com/> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+ex:Alice
+	a ex:Person ;
+	ex:ssn "987-65-432A" .
+  
+ex:Bob
+	a ex:Person ;
+	ex:ssn "123-45-6789x" ;
+	ex:ssn "124-35-6789" .
+  
+ex:Calvin
+	a ex:Person ;
+	ex:birthDate "1971-07-07"^^xsd:date ;
+	ex:worksFor ex:UntypedCompany .

examples/shacl_example_shapes.ttl

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+@prefix ex: <https://example.com/> .
+@prefix sh: <http://www.w3.org/ns/shacl#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+
+ex:Person a owl:Class .
+
+ex:PersonShape
+	rdfs:label "PersonTest";
+	a sh:NodeShape ;
+	sh:targetClass ex:Person ;    # Applies to all persons
+	sh:property [                 # _:b1
+		sh:path ex:ssn ;           # constrains the values of ex:ssn
+		sh:maxCount 1 ;
+		sh:datatype xsd:string ;
+		sh:pattern "^\\d{3}-\\d{2}-\\d{4}$" ;
+	] .

examples/test.jsonld

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+{
+    "@context": {
+        "@vocab": "https://example.com/a/",
+        "@base": "https://example.com/b/",
+        "myns": "https://example.com/a/",
+        "otherns": "https://example.com/b/",
+        "owl": "http://www.w3.org/2002/07/owl#"
+    },
+    "@graph": [{
+        "@id": "b123",
+        "@type": "Fish",
+        "name": "What a nice name",
+        "linkedTo": {
+            "@id": "b456",
+            "name": "That's a silly name",
+            "@type": "Squid",
+            "linkedTo": {
+                "name": "No names are cool"
+            }
+        }},
+        {"@id": "myns:Fish", "@type": "owl:Class"}
+    ]
+}

examples/test_frame.jsonld

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+{
+    "@context": {
+        "@vocab": "https://example.com/a/",
+        "@base": "https://example.com/b/",
+        "myns": "https://example.com/a/",
+        "otherns": "https://example.com/b/",
+        "owl": "http://www.w3.org/2002/07/owl#"
+    },
+    "@type": "myns:Fish"
+}