xml-dev - Re: Q: Are entities containing mark-up allowed in attribute values?

[John Cowan <jcowan@reutershealth.com>]

> Rob Lugt wrote:

> [I]s the following document well-formed?
> 
> <?xml version="1.0"?>
> <!DOCTYPE message [
> <!ENTITY greet "<greeting>Hi</greeting>">
> ]>
> <!--Atribute value has an entity reference: &greet; which contains mark-up! -->
> <message value="&greet;"/>

No.  The character "<" may not appear in any attribute value, either directly
or indirectly.  It can appear only through a character reference or a reference
to an entity (such as lt) containing a character reference.

> If not, can somebody point out where in the XML 1.0 spec this is mandated?

Section 3.1, the WFC "No < in Attribute Values".  The reference to &lt; in this
constraint has been removed by an erratum.

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