Implementing " and ' in literals

In XML::XPath (perl's XPath processing module) I implemented translation
of " and ' in literals to " and ' respectively. I know this
isn't in the spec, so I thought I'd better hash it out a bit first. I've
heard people call for this feature before, so I figured it might be
useful. An alternate way of doing this is to use the C escape mechanisms,
although then you'd have to build support way back into the tokenizer,
which is far harder.

So what do people think of this? It allows you to do the following in your
XSLT:

<xsl:value-of select="&quot;I'm feeling &amp;quot;sad&amp;quot;&quot;"/>

Which gives you a literal of:

I'm feeling "sad"

(I know it's yucky - but that's entities for you!)

-- 
<Matt/>

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