[VCARDDAV] How to encode X-Properties in XML?

[Simon Perreault <[e-mail]>]

WG,

The main open issue we have for vCard XML is that of encoding 
X-Properties in XML. vCard uses X- for unregistered extensions, while 
vCard XML uses XML namespaces. It's not clear how to automatically 
convert from one to another.

A proposal: Create an XML namespace for X- properties. Put the content 
into a <text> element.

Example:

X-FOO:bar

would translate into:

<foo xmlns="urn:ietf:params:xml:ns:vcard-4.0:xname"><text>bar</text></foo>

We don't need to add anything to the schema since we already specify 
that an XML vCard parser MUST ignore elements in namespaces it doesn't 
recognize. (Maybe we can add text to force it for this namespace.)

Simon
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