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Re: parameter-entity references

• To: xml-dev@l...
• Subject: Re: parameter-entity references
• From: Richard Tobin <richard@c...>
• Date: Fri, 7 Feb 2003 21:42:18 GMT
• Cc:
• In-reply-to: <45CA0E126ADBD4118A9E00B0D049862605C077C1@w...>
• Organization: HCRC, University of Edinburgh

><!ENTITY % dog '% cat "c'>
><!ENTITY %dog; at">

Parameter entities are recognised in entity values and expanded
immediately, so there is a syntax error in the first line because the
percent is not followed by a name.

If we replace the % with &#x25; we are left with a string literal in
line two that goes past the end of the entity containing the start
of the literal.  I don't think this is ruled out (as it should be)
by the grammar.  (The XML grammar doesn't have "entity end" markers.)


><!ELEMENT % dog "cat (AAA* ,">

(you mean !ENTITY, right?)

><!ELEMENT %dog; BBB)>

This is "merely" a validity error: the content particle ends in a different
entity from the one it starts in.

><!ELEMENT % dog "#PCDATA)">
><!ELEMENT cat (%dog;> 

Similarly for this one.

-- Richard

• References:
  • parameter-entity references
    • From: Marko Milicevic <MMilicevic@p...>

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