XSD help

[Md Fizal]

I'm designing a new XSD and having trouble defining the following condition:

In my XML, I want to define a condition saying, only if tag 'Key' exists then tag 'Value' is a required one, otherwise not. This also means that tag 'Key' is optional too.

How do I define this in XSD?

[Madhav Lakkapragada]

<!-- pseudo code. You need to do some hemework, right?. -->
<define a type>
<xsd:sequence>
<define a key tag>
<define a value tag>
</xsd:sequence>
<end define of type>

This is the concept you need.

- m