[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML processor behavior with unused NS declarations
Hi Chuck, Sorry to be late to this thread. It sounds like you've gotten your answer already: don't throw the namespace declaration away. If you're interested in reading some more discussion/background on the reasons why, check out the "QNames in Content" section of a paper/chapter I wrote called "Understanding XML Namespaces".[1] Of course, it's always safe to throw away *redundant* namespace declarations when serializing XML, provided you're not just serializing a fragment (in which case it wouldn't be redundant anymore). For example, if the <h2> element in your example merely repeated the xmlns:dc declaration verbatim, it would be safe to leave that out of your serialized result. (And Canonical XML *requires* such superfluous namespace declarations to be removed.) You just can't make any removals that would make a difference to the XPath data model's abstraction of your document. Evan Lenz Lenz Consulting Group [1] http://lenzconsulting.com/namespaces/#qnames_in_content [2] http://www.w3.org/TR/xml-c14n#SuperfluousNSDecl Chuck Bearden wrote: > Is a namespace-aware XML processor permitted to drop a namespace > declaration when no elements or attributes in that namespace are used > within the scope of the declaration? Say, given this example from the > RDRa Primer: > > <div xmlns:dc="http://purl.org/dc/elements/1.1/"> > <h2 property="dc:title">The trouble with Bob</h2> > <h3 property="dc:creator">Alice</h3> > ... > </div> > > there's no danger of the processor dropping the 'xmlns:dc' > declaration, correct? > > I looked at the Namespaces in XML recommendation, and it doesn't > mention omitting them. A namespace-unaware processor would treat NS > declarations like attributes and hence not drop them, so I reckon that > a NS-aware processor should match that behavior as well, but > confirmation from the cognoscenti is welcome! > > Thanks > Chuck
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