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The current draft for JSON-LD framing (January 2018) does not mention blank nodes in the frame matching algorithm specification and a strict interpretation of the first test goes a bit against the semantics of RDF in case a frame includes blank nodes:
1 Node matches if it has an @id property value which is also a value of the @id property in frame.
According to its definition, a frame is a JSON-LD document, meaning it can include blank nodes. if it happens, blank nodes in the frame will match blank nodes in a document only if they have the same ID and I believe that the Ruby implementation performs simple string comparison.
In RDF, shared blank nodes require a special handling and we loose that specificity here. It would be good to either redefine JSON-LD frames such that blank nodes are not allowed or precise the specification of frame matching. I would be in favor of the latter approach.
Blank nodes in JSON-LD frames might be useful when nodes have multiple relations to each other. For instance, nodes matching the following frame represent all alumni of a university who still work for that university:
Blank nodes in JSON-LD frames might be useful when nodes have multiple relations to each other. For instance, nodes matching the following frame represent all alumni of a university who still work for that university
I think N3 and SPARQL would use variables in such cases ?univ
The current draft for JSON-LD framing (January 2018) does not mention blank nodes in the frame matching algorithm specification and a strict interpretation of the first test goes a bit against the semantics of RDF in case a frame includes blank nodes:
According to its definition, a frame is a JSON-LD document, meaning it can include blank nodes. if it happens, blank nodes in the frame will match blank nodes in a document only if they have the same ID and I believe that the Ruby implementation performs simple string comparison.
In RDF, shared blank nodes require a special handling and we loose that specificity here. It would be good to either redefine JSON-LD frames such that blank nodes are not allowed or precise the specification of frame matching. I would be in favor of the latter approach.
Blank nodes in JSON-LD frames might be useful when nodes have multiple relations to each other. For instance, nodes matching the following frame represent all alumni of a university who still work for that university:
Original issue json-ld/json-ld.org#579.
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