parent node/ child node

Hi,

	I'm trying to replace a missing attribute in a node with the a default
	that is stored in its' parent node. i.e.:

	from this:
	<parent defaultAttribute="defaultAttributeValue">
		<child attribute="attributeValue"/>
		<child attribute="attributeValue"/>
		<child/>
		<child attribute="attributeValue"/>
	</parent>
	<parent defaultAttribute="defaultAttributeValue1">
		<child attribute="attributeValue"/>
		<child attribute="attributeValue"/>
		<child attribute="attributeValue"/>
		<child/>
	</parent>


	to this after the transformation:

	<parent defaultAttribute="defaultAttributeValue">
		<child attribute="attributeValue"/>
		<child attribute="attributeValue"/>
		<child defaultAttribute="defaultAttributeValue"/>
		<child attribute="attributeValue"/>
	</parent>
	<parent defaultAttribute="defaultAttributeValue1">
		<child attribute="attributeValue"/>
		<child attribute="attributeValue"/>
		<child attribute="attributeValue"/>
		<child defaultAttribute="defaultAttributeValue1"/>
	</parent>

	When the child attribute is missing I would like to add the
	defaultAttribute of the appropriate parent.
	All the parent tags have the same name.




	Does anyone know if this is possible, and if yes what direction I should take.

	many thanks,

	james

	
		



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