xml-dev - Re: Q: Using XML entities for href's - More questions about entities

["Eve L. Maler" <elm@arbortext.com>]

I haven't used MSXML; perhaps it's buggy in this respect.  By eye, this looks okay to me.

Eve

At 02:56 PM 3/3/98 -0500, Wilf Reedijk wrote: 
>>>>
> 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: 
>
>
>
> <?XML version="1.0"?> 
> <!DOCTYPE TREE [ 
> <!ENTITY TEST "myapp"> 
> <!ELEMENT TREE (CATEGORY)*> 
> <!ELEMENT CATEGORY (ADDURL?,EDITURL?,(CATEGORY|APP)*)> 
> <!ATTLIST CATEGORY 
> name CDATA #REQUIRED> 
> <!ELEMENT APP (ADDURL?,EDITURL?)> 
> <!ATTLIST APP 
> name CDATA #REQUIRED 
> thing CDATA #IMPLIED> 
> <!ELEMENT ADDURL (#PCDATA)*> 
> <!ELEMENT EDITURL (#PCDATA)*> 
> ]> 
> <TREE> 
> <CATEGORY name="mycategory"> 
>
>
> <APP name="&TEST;"> 
> <ADDURL>  someurl </ADDURL> 
> <EDITURL> anotherurl </EDITURL> 
> </APP> 
> </CATEGORY> 
> </TREE> 
>
>
>
> 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 are used? 
>
>
>
> 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.) 
> >
> > Eve 
>     
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