@typeof is unique in that it sets both a predicate and an object at the same time (and also a subject when it appears in the absence of other attributes that would set a subject). Inline content might also set an object, if @content is not present, but @property is present. The attributes for setting a predicate are @rel, @rev and @property, whilst the attributes for setting an object are @resource, @href, @content, and @src.
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A conforming RDFa Processor MUST make available to a consuming application a single RDF graph containing all possible triples generated by using the rules in the Processing Model section. The output graph and the processor graph are separate graphs and MUST NOT be stored in the same graph by the RDFa Processor. This specification uses the term output graph to mean all of the triples asserted by a document according to the Processing Model section. The term processor graph is used to denote the collection of all informational, warning, and error triples that MAY be generated by the RDFa Processor to report its status. However, processors may permit the two graphs to be retrieved together; see Section 7.
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The event handler(s) may be defined within the contents of the script element or in an external file. If the src attribute is not set, user agents MUST interpret the contents of the element as the handler. If the src has a URI value, user agents MUST ignore the element’s contents and retrieve the handler via the URI.
In RDFa the Host Language may provide a mechanism for setting the language tag. 2 RDFa Host Language Conformance. And an optional language. Host Languages that incorporate RDFa must adhere to. Current language is set accordingly; Host Languages that incorporate RDFa MAY provide a.
This vocabulary description SHOULD be available encoded in RDFa, and MAY also be available in other RDF serialization syntaxes (using content negotiation to choose among the different formats). , expiration date. If possible, vocabulary descriptions SHOULD include subproperty and subclass statements linking the vocabulary terms to other, well-known vocabularies. For publishers of vocabularies, the IRI for the vocabularies SHOULD be dereferenceable, and should return an RDF graph with the vocabulary description. Finally, HTTP responses SHOULD include fields usable for cache control, e.
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(An RDFa processor capable of vocabulary expansion MUST accept an RDF graph serialized in RDFa, and SHOULD accept other standard serialization formats of RDF such as RDF/XML [RDF-SYNTAX-GRAMMAR] and Turtle [TURTLE]. A vocabulary graph is created as follows: Each object IRI in the output graph that has a subject the current document (base) IRI and a predicate of rdfa:usesVocabulary is dereferenced. If the dereferencing yields the serialization of an RDF graph, that serialization is parsed and the resulting graph is merged with the vocabulary graph.
An initial context is either intrinsically known to the parser, or it is loaded as external documents and processed. Such a context is a collection of terms, prefix mappings, and/or a default vocabulary declaration. They MAY also be defined in other formats (e. RDFa permits Host Languages to define an initial context. When an initial context document is processed, it is evaluated as follows:. , RDF/XML [RDF-SYNTAX-GRAMMAR], or Turtle [TURTLE]). These documents MUST be defined in an approved RDFa Host Language (currently XML+RDFa, XHTML+RDFa [XHTML-RDFA], and HTML+RDFa [HTML-RDFA]).
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Conversely, if you didn’t write a compiler in your language, there’s a good chance it misses something that’s really important to somebody, because the language implementors never had to write a program that would require them to think about all those issues. That means if the compiler is self-hosted, then it’s pretty sure to be able to do what I need, no matter what I’m doing.