#128: Added links to prefix declaration (#356)

Author: HolgerKnublauch

shacl12-sparql/index.html

@@ -595,6 +595,9 @@ <h3>An Example SPARQL-based Constraint</h3>
 			}
 			""" ;
 	] .
+
+ex:
+	sh:declare ...   # See <a href="#prefixes-example">prefix declarations</a>	
 						</div>
 					</div>
 					<p>
@@ -658,6 +661,9 @@ <h3>An Example SPARQL-based Constraint</h3>
 			}
 			""" ;
 	] .
+
+ex:
+	sh:declare ...   # See <a href="#prefixes-example">prefix declarations</a>	
 						</div>
 					</div>
 				</aside>
@@ -699,20 +705,20 @@ <h4>Prefix Declarations for SPARQL Queries</h4>
 						A <a>shapes graph</a> may include declarations of namespace prefixes so that these prefixes can be used to abbreviate the SPARQL queries derived from the same shapes graph.
 						The syntax of such prefix declarations is illustrated by the following example.
 					</p>
-					<aside class="example">
+					<aside class="example" id="prefixes-example">
 						<div class="shapes-graph">
 							<div class="turtle">
 ex:
-	a owl:Ontology ;
-	owl:imports sh: ;
 	sh:declare [
 		sh:prefix "ex" ;
 		sh:namespace "http://example.com/ns#"^^xsd:anyURI ;
 	] ;
 	sh:declare [
 		sh:prefix "schema" ;
 		sh:namespace "http://schema.org/"^^xsd:anyURI ;
-	] .
+	] ;
+	a owl:Ontology ;    # Optional
+	owl:imports sh: .   # Optional
 							</div>
 						</div>
 					</aside>