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Hi Helen, > I have a stock element. This element has several child elements eg > Currency, number and name. My problem is that I want (if possible to > allow a choice re the type_of_stock. I want to limit it to either > Equity or Bond - I have found two ways of doing this - either using > enumeration or patterns. I have no preference as to which. You should prefer enumeration. Schema editors/processors can't inspect a pattern to work out what the possible values are, but they *can* inspect an enumeration to do so. If you have a choice between using a pattern and using one of the other facets to express a constraint, you should always the other facet. > However if they select BOND I want to force the user to input > further elements eg the Interest_rate. I *think* that what you might be trying to do is make the Bond element be present if the type_of_equity element has the value of 'BOND' and the Equity element be present if the type_of_equity element has the value 'EQUITY'. If so, then you can't do that in W3C XML Schema unless you supplement it with Schematron; or you can use RELAX NG of course. If you just want to say that the type_of_stock element can either contain an Equity element or a Bond element, then, as Andrew said, use <xs:choice> to give a choice between Bond or Equity elements. Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/
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