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To: dev@geronimo.apache.org
From: David Jencks <david_jencks@yahoo.com>
Subject: The evil of mixed content rears its ugly head in the config.xml
 local-attributes-1.1 schema
Date: Wed, 31 May 2006 18:01:42 -0700

Now that we have a schema for config.xml it's become more painfully  
obvious that we are putting mixed content into the attribute elements  
of config.xml.  You can override an xml-attribute in a gbean such as  
the <defaultEnvironment> elements in the builders by putting the  
override xml right into an attribute element in config.xml.  This  
works great and we use it in the tck setup.

The schema validation we now seem to be doing is emitting warnings like:

Booting Geronimo Kernel (in Java 1.4.2_09)...
Warning: validation was turned on but an org.xml.sax.ErrorHandler was  
not
set, which is probably not what is desired.  Parser will use a default
ErrorHandler to print the first 10 errors.  Please call
the 'setErrorHandler' method to fix this.
Error: URI=null Line=105: cvc-complex-type.2.2: Element 'attribute'  
must have no element [children], and the value must be valid.
Error: URI=null Line=125: cvc-complex-type.2.2: Element 'attribute'  
must have no element [children], and the value must be valid.
Error: URI=null Line=149: cvc-complex-type.2.2: Element 'attribute'  
must have no element [children], and the value must be valid.
Error: URI=null Line=179: cvc-complex-type.2.2: Element 'attribute'  
must have no element [children], and the value must be valid.
Error: URI=null Line=207: cvc-complex-type.2.2: Element 'attribute'  
must have no element [children], and the value must be valid.

so... what to do??

1. ignore these messages, after all it works
2. Try to modify the attributes-1.1 schema to allow mixed content.   
Today anyway this is beyond my schema-fu.  In any case mixed content  
is pretty evil, we should try to avoid it if possible.
3. Introduce an xml-attribute element in config.xml.  This is going  
to require bigger changes in the object model holding the values:  
we'll need either a new element or a flag to tell it to write out  
<xml-attribute...> rather than <attribute...>

(3) is probably the most plausible way to go, but I'm not  
enthusiastic about cramming this into 1.1.  I think (1) for 1.1  
followed by more thought and perhaps (3) for 1.2 is the way to go.

Thoughts?

thanks
david jencks