Use of '&' in element of XML Document

[Richard Tobin]

> 	<!ENTITY amp "&x0026;" >

Actually this isn't quite right.  There's a typo (it should be &#00026;)
but there's also a less obvious error.

The declaration above will define amp to contain the single character
"&", since character entities in entity definitions are expanded.
When the entity is used, it will be re-expanded, producing a syntax
error, since the parser encounters a bare ampersand.  The solution is
to use a "double-escape" in the definition, like this:

     <!ENTITY amp "&#x0026;#x0026;">

or equivalently

     <!ENTITY amp "&#38;#38;">

which is the "canonical" definition given in the XML spec.

The effect of this is that amp is defined as "&#38;" and this is
expanded to produce "&" when the amp is referenced in the document.

-- Richard

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