On Tue, Sep 22, 2009 at 1:43 PM, Jonas Sicking <jo...@sicking.cc> wrote: > On Tue, Sep 22, 2009 at 1:07 PM, Shane McCarron <sh...@aptest.com> wrote: >> >> >> Jonas Sicking wrote: >> >> I would say there are two separate things that are missing: >> >> The most substantial one is how to do prefix mappings in a DOM or a >> HTML document. Prefix mapping is currently defined using the >> Namespaces in XML recommendation. However this recommendation only >> defines how prefix mappings are done in a serialized XML document. I >> hope we can all agree that neither DOMs (an in-memory datastructure) >> or HTML documents are not XML documents. >> >> For example, if I have a DOM and I want to do map the prefix "foo", >> which of the following algorithms should I use: >> 1. Call Node.lookupNamespacePrefix as defined by DOM Level 3 using >> "foo" as the prefix argument. >> 2. Walk up the parent chain looking for an element with an attribute >> with localName "foo" and namespace "http://www.w3.org/2000/xmlns/";, >> and then use the value of that attribute. >> 3. Walk up the parent chain looking for an element with an attribute >> with tagName "xmlns:foo", and then use the value of that attribute. >> 4. Walk up the parent chain looking for either the attribute in 2 or >> 3, and if both are specified use some prioritization order. >> 5. Walk up the parent chain looking for either the attribute in 2 if >> the document was parsed as XHTML, or attribute in 3 if the document >> was parsed as HTML. >> 6. Do something else? >> >> Any of 1 to 5 (as well as possibly 6) seems equally valid to me, and >> as far as I can tell there really is no specified answer. >> >> >> Nor should there be. This presupposes a DOM-based processing model. While >> you *might* be using a DOM, you don't need to. > > Sure, but if you have a DOM, what do you do? One solution is certainly > to say that "If you have a DOM, there is no way to extract RDFa data". > This is certainly a possibility, but it does mean that it's impossible > to
... to build a RDFa implementation in javascript, as javascript is handed a DOM. I don't know if javascript implementations of RDFa is something that's considered important. / Jonas
