add logical iterable and describe natural mappings #144
Conversation
pmaria
requested review from
bjdmeest,
andimou,
DylanVanAssche,
dachafra,
anaigmo and
elsdvlee
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| The <dfn>natural RDF literal</dfn> is a [=literal=] that is the result of applying a [=natural mapping=] on a value of a [=data source=], which produces a [=literal=] that is the most appropriate representation of the value in RDF. The [=natural RDF literal=] has a [=natural RDF lexical form=]. | ||
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| The <dfn>natural RDF lexical form</dfn> produces only the [=lexical form=] of the [=literal=] and recommends that implementations SHOULD apply the [=XSD canonical mapping=], making it a [=canonical RDF lexical form=]. It is used in RML when non-string [=expression evaluation results=] are used in a string context, for example when a timestamp is used in an [=template-valued term map=] with [=term type=] [=IRI=]. |
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Why does it recommend to apply the XSD canonical mapping?
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This follows how it is defined in R2RML. Something to discuss in the next meeting perhaps?
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Yeah, I have the feeling the phrasing is a bit off, I'd suggest "The natural RDF lexical form is the [=lexical form=] of the [=literal=]. Implementations SHOULD apply the [=XSD canonical mapping=], making it a [=canonical RDF lexical form=]."
| * a [=subject map=] (`rml:SubjectMap`) | ||
| is a rule that MUST generate either an [=IRI=] or a [=blank node=]; | ||
| * a [=predicate map=] (`rml:PredicateMap`) | ||
| is a rule that MUST generate an [=IRI=]; | ||
| * an [=object map=] (`rml:ObjectMap`) | ||
| is a rule that MUST generate an [=IRI=], a [=blank node=] or a [=literal=]; | ||
| * a [=graph map=] (`rml:GraphMap`) | ||
| is a rule that should generate an [=IRI=]. | ||
| is a rule that SHOULD generate an [=IRI=]. |
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Good question. I am not sure why this is a SHOULD. R2RML seems to require that a graph map always produces an IRI. However, there is no such requirement in RDF (https://www.w3.org/TR/rdf12-concepts/#dfn-graph-name).
Also something to discuss perhaps. I will raise an issue for this one.
| @@ -21,15 +21,15 @@ if it is a rule that specifies how the [=RDF triple=]'s object is generated; and | |||
| * a [=graph map=] (`rml:GraphMap`), | |||
| if it is a rule that specifies how the [=RDF triple=]'s [=named graph=] is generated. | |||
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| A [=term map=] generates different RDF terms depending on the position of the [=term map=] in the [=RDF triple=]: | |||
| A [=term map=] generates different types of [=RDF terms=] depending on the position of the [=term map=] in the [=RDF triple=]: | |||
| * a [=subject map=] (`rml:SubjectMap`) | |||
| is a rule that MUST generate either an [=IRI=] or a [=blank node=]; | |||
| * a [=predicate map=] (`rml:PredicateMap`) | |||
| is a rule that MUST generate an [=IRI=]; | |||
| * an [=object map=] (`rml:ObjectMap`) | |||
| is a rule that MUST generate an [=IRI=], a [=blank node=] or a [=literal=]; | |||
| * a [=graph map=] (`rml:GraphMap`) | |||
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graph maps are not 'defined', the reference doesn't work
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Indeed. The graph maps section still needs to be written.
Co-authored-by: elsdvlee <[email protected]>
Logical Iterableas a more abstract concept thanLogical Sourcethat will be used for defining fields in rml-lv.