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We have specific XML that has specific structure:
<root>
<element type=”a”>
<value>someValueA</value>
</element>
<element type=”b”>
<value>someValueB</value>
</element>
</root>
Is it possible to validate it using XSD in such a way that the element with type “a” is required and that of type “b” is not required?
In XSD 1.0 you can’t apply different constraints to different sibling elements that have the same element name.
It looks like you need XSD 1.1 assertions – available now in Saxon and Xerces.