• To: <bry@i...>,<xml-dev@l...>
• Subject: RE: namespace handling models
• From: "Danny Ayers" <danny666@v...>
• Date: Sun, 4 Jan 2004 18:34:41 +0100
• Importance: Normal
• In-reply-to: <200401041747323.SM01020@Debug>

> am wondering if anyone can think of any
> other models for how xml applications handle
> namespaces that are not in the applications
> known namespaces than these:
>
> parse-tree: all elements in the unknown
> namespace is ignored, and children of the
> element are parsed.
>
> ignore-tree: as soon as an element in an
> unknown namespace is encountered that
> element and any children are ignored.
>
> fail: unknown namespaces are a cause for
> failure. Generally due to validation
> failure.

Yep - not ignoring the unknown namespaced elements/attributes. With RDF/XML
partial knowledge can be inferred from the structural relationships between
the XML entities, the clearest example being 'striping':

<x:a>
	<y:b>
		<z:c/>
	</y:b>
</x:a>

Assuming x:a is an rdfs:Class, the application can tell that y:b is an
rdfs:Property and z:c is another rdfs:Class.

Additionally, if the application knew the namespace y: (i.e. it had the RDF
schema for it) there may be domain and range restrictions for the property
y:b, from which the application can infer rdf:type's for x:a and z:c,
without knowing anything else about x: and z:.

Cheers,
Danny.

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