I think a good extension of the current ShEx specification could be to allow reverse arcs, which would allow to express constraints on the shape of arcs that arrive to a given node, i.e. not only on the arcs departing from a node, but also the arcs that receives a node. For example, if I want to express that countries are the reference area of zero or more observations, I can express it by: <Country> { rdfs:label xsd:string , ^ :ref-area @<observation>* # ^ means that it receives the arc ":ref-area" } <Observation> { :value xsd:integer , :ref-area @<Country> } In this way, a model like the following could validate: :esp rdfs:label "Spain" . :o1 :value 23, :ref-area :esp . :o2 :value 45, :ref-area :esp . I used the symbol "^" but I am not sure if it is reserved for other purposes. In fact, I noticed that the BNF grammar ( http://www.w3.org/2013/ShEx/ShEx.bnf) has reserved the symbols "!" and "^" at the beginning of arc definitions...what is their purpose? -- Best regards, LabraReceived on Wednesday, 5 February 2014 21:31:19 UTC
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