they used to be allowed all over the place in SGML, but in XML conditionals are only allowed within the dtd (possibly only the external subset)
the contents of the first one is included in the dtd, the contents of the second is ignored
the only serious use i've seen these put to is the docbook dtd (and it uses them everywhere) to allow for coarse customisation - however the syntax is a little different:-
<!ENTITY % ENT_NAME "INCLUDE"> <![ %ENT_NAME; [ BODY_OF_SECTION_HERE ]]>
thus a redefinition of the ENT_NAME parameter entity to "IGNORE" means the contents of the section will not be part of the validation process
in your case only direct editing of this file would have any effect so i don't really see the point (commenting the attlist out would be just as good)
the spec:- http://www.w3.org/TR/REC-xml#sec-condition-sect
how docbook does it:- http://www.docbook.org/tdg/en/html/ch05.html
roll on relaxng! :-)
Niclas Hedhman wrote:
Hi,
I'm not very good in DTD syntax, but normally gets by just fine, until....
<![INCLUDE[
<!ELEMENT timezone %ematrix-string;>
]]>
<![IGNORE[
<!ATTLIST datetime timezone (GMT-12|GMT-11|HST|HDT|GMT-10|YST|YDT|GMT-9|PST|PDT|GMT-8|MST|MDT|GMT-7|
CST|CDT|GMT-6|EST|EDT|GMT-5|AST|ADT|GMT-4|GMT-3|GMT-2|GMT-1|GMT|
MET|MET DST|GMTplus1|EET|EET DST|GMTplus2|GMTplus3|GMTplus4|GMTplus5|
GMTplus6|GMTplus7|WST|GMTplus8|JST|GMTplus9|GMTplus10|GMTplus11|NZST|
NZDT|GMTplus12) #REQUIRED>
]]>
Does any know what the INCLUDE and IGNORE means?
Niclas
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