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Extending xsd schema with "choice" model group

 
Jaikiran Pai
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I am playing with some xsd stuff these days. One of the things i am trying to do is extend an existing xsd to provide more elements in the new one. The base xsd looks like this:


The extended xsd is as follows:




So here i have a "coloursType" with a choice of "red" and "blue" and the extended "more-coloursType" has the additional "dark-red" and "dark-blue". Then in my xml i am trying to do this:



So in the xml, i am trying to use the extended "more-coloursType" and specifying a "dark-red" value. But this fails validation, with a message saying that "dark-red" is not allowed in this place. It starts working if i first have a normal colour (either red or blue) and then have dark-red:



My understanding was with this kind of extension, with the "choice" elements i would have something like:



but this doesn't seem to be the case. Am i missing something? Any changes that i'll have to make to my xsd to allow:

 
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