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Dare Wrote: >I'm not sure I understand your question. The content model of a type >definition only appears in an instance document if an instance of the type >is used in the document. Also, in the content model are you trying to say > one or the other but not both >or > neither, one or both >because your schema fragment describes the latter although I suspect you >want the former. I'm wanting one or both. I'm new to XML-Schema so bear with me please My fragment as you stated will do neither, one or both. What the requirments are is if the element <timeframe> exists than either <earliestdate> or <latestdate> is required. David Wrote: > My question is this, in a Schema is it possible to have an element be > required only if its parent element exists. > > For example in the code below if timeframetype exists then either > earliestdate or latestdate would be required, 1 or the other but both are > not required. > > Thanks for any help in advance. > > David Yancey > david_yancey@h... > > > <xs:complexType name="timeframeType"> > <xs:sequence> > <xs:element ref="description"/> > <xs:element ref="earliestdate" minOccurs="0"/> > <xs:element ref="latestdate" minOccurs="0"/> > </xs:sequence> > </xs:complexType> > > > _________________________________________________________________ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com
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