- From: Wilf Reedijk <wilfr@m...>
- To: xml-dev@i...
- Date: Tue, 03 Mar 1998 11:56:08 -0800
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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