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From David Jencks <>
Subject Re: CDATA and GBean attributes
Date Tue, 22 Feb 2005 20:28:56 GMT

On Feb 22, 2005, at 12:56 PM, Aaron Mulder wrote:

> 	Is it possible to validate the "outer" content but not the "inner"
> content?

no, that is a very large part of my argument against naked xml.  
Whatever xml technology we use, I don't want it poking around inside my 
attribute contents.  AFAIK the only way to acheive this is with CDATA.
>   I'm worried about the case where we validate our plan, and the
> inner content includes, say, namespaces with HTTP references to 
> schemas,
> and we end up trying to validate the inner content, perhaps having 
> trouble
> due to slow network connections to wherever the schemas are stored, or
> something like that.  I'd rather just treat all the "inner" data as an
> unrecognizable blob, which is what CDATA provides.
> 	Also, I'm not sure we should always fail if it's invalid -- what
> if the PropertyEditor (or whatever's going to handle it) is quite
> forgiving but it looks bad to us?

For instance, suppose the attribute content is a jmx mlet tag -- looks 
like xml but isn't (no closing tag stuff at the end)

david jencks
> Aaron
> On Tue, 22 Feb 2005, Dain Sundstrom wrote:
>> On Feb 22, 2005, at 11:01 AM, David Jencks wrote:
>>> On Feb 22, 2005, at 10:38 AM, Dain Sundstrom wrote:
>>>> On Feb 22, 2005, at 10:27 AM, David Jencks wrote:
>>>>> I'm not sure this is such a good idea.
>>>>> It's going to require changing the gbean schema to allow an any
>>>>> element and mixed content in a gbean attribute element.   In
>>>>> principle I object strongly to mixed content.
>>>> What's the big deal.
>>> mixed content is a disaster.
>>> -100 on any use of mixed content unless the results cannot be 
>>> achieved
>>> any other way.
>> I still don't get why.
>>>>  This is a leaf node (from our view) so if they want to have plain
>>>> text or XML that seems fine to me; it is not like html were we would
>>>> need to pick our bits out of it.  If they actually want mixed 
>>>> content
>>>> (xhtml), that would be fine with me also.  It seems reasonable to me
>>>> to say, this is your slot for your data, put what ever you want in
>>>> it.
>>> perhaps in an ideal world, but this is xml, not an ideal world.  IMO
>>> the xml processing for the gbean deployment should not be looking at
>>> what is in an attribute value: the PropertyEditor should be doing
>>> that.  AFAIK the only way to prevent xml processors of any sort from
>>> looking at the "xml" contents is to wrap them in CDATA.
>> I understand the processor will look for well formed and valid XML, 
>> but
>> I don't see why that prevents us from using mixed context.  I mean
>> XHTML uses this and Xerces can process that.  Is there something in 
>> our
>> xml processing code that makes this an impossible feature?
>>>>> I think the extra complications indicate that the CDATA solution is
>>>>> much much simpler.  Is there a problem with it?  What are you 
>>>>> trying
>>>>> to pass in?  What are you doing with the results? Do you  want an
>>>>> XmlObject, a string, a DOM element, a STAX stream...?
>>>> I believe my original code supported creating a DOM.  IIRC, I just
>>>> get the content as a string and pass it to the java beans 
>>>> converters.
>>> Unless you use CDATA, the xml processing for the gbean will construct
>>> an xml model for the contents.  I think this is just plain a really
>>> bad idea.
>> Maybe this is a problem with XMLBeans.  Does XMLBeans not support 
>> mixed
>> context?
>>> I want to get a string and pass it to the appropriate PropertyEditor.
>>> If it wants a STAX stream, XmlObject, DOM, whatever, it's welcome to
>>> build that itself.
>> I totally agree.  But we should be able to have plain old xml in an
>> attribute and pass that in plain text form to the property editor,
>> which will reinterpret it as a a DOM, STAX stream, XmlObject or
>> whatever.  We totally agree on this point.  The difference is do we
>> have to wrap this in CDATA, and I feel mixed content is part of the 
>> xml
>> standard (their the ones that named it mixed content) so we should be
>> able to use it.
>> -dain

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