Q: Using XML entities for href's - More questions about entities
wilfr at mail.bc.rogers.wave.ca
Tue Mar 3 19:54:07 GMT 1998
When I try to reference an entity within an attribute value, the parser (I am
using msxml) complains.
The message that I am getting is 'Invalid element in context of 'APP'. Expected
[ADDURL,EDITURL] in line 3 and column 18. This message makes no sense to me.
Here is my XML:
<!DOCTYPE TREE [
<!ENTITY TEST "myapp">
<!ELEMENT TREE (CATEGORY)*>
<!ELEMENT CATEGORY (ADDURL?,EDITURL?,(CATEGORY|APP)*)>
name CDATA #REQUIRED>
<!ELEMENT APP (ADDURL?,EDITURL?)>
name CDATA #REQUIRED
thing CDATA #IMPLIED>
<!ELEMENT ADDURL (#PCDATA)*>
<!ELEMENT EDITURL (#PCDATA)*>
<ADDURL> someurl </ADDURL>
<EDITURL> anotherurl </EDITURL>
How do we use entities within attributes?
I find the whole concept of entities to be a bit confusing (internal vs.
external; general vs. parameter; parsed vs. unparsed etc.). Is there a site where
one could find some good examples describing how the various types of entities
Eve L. Maler wrote:
> It's legal to reference a parsed entity from an attribute value, and every
> XML processor should be able to handle it. To do this properly, the
> reference would have to look like this:
> <aTag xml-link="simple" href="&aRef;">content</aTag>
> (Using an ENTITY-type attribute wouldn't automatically expand it in place,
> and anyway, has to be used exclusively with unparsed entities -- those with
> an NDATA notation.)
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