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No! There is no requirement about that! The definition is "just a
string":<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.w3.org/TR/xptr-framework/#term-xdi">http://www.w3.org/TR/xptr-framework/#term-xdi</a><br>
<br>
[<a name="term-xdi" id="term-xdi" title="externally-determined ID">Definition</a>:
An <b>externally-determined ID</b>
is a string, representing <br>
an element identifier, whose value is
determined by the application <br>
through mechanisms outside the scope of
this specification.]<br>
<br>
Aleksey.<br>
<br>
Rich Salz wrote:<br>
<blockquote type="cite" cite="mid3F7314D6.1090705@datapower.com">
<blockquote type="cite"> 4.
<br>
An element information item may also be identified by an
<br>
externally-determined ID value.
<br>
</blockquote>
<br>
But it still must match the NCName production, which is equivalent to
the Name production without the colon. And XML ID's must also match
the Name production.
<br>
<br>
/r$
<br>
</blockquote>
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