[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Restrictions on existence of attributes?
Howard, In general Xml Schema doesn't support co-occurrence constraints and the generic answer is to use something like Schematron. However, there are exceptions and your case is one of them. The following schema enforces that one and only one of a1, a2, or a3 attributes appears in the instance document: <xs:element name="e1"> <xs:complexType> <xs:attribute name="a1" /> <xs:attribute name="a2" /> <xs:attribute name="a3" /> </xs:complexType> <xs:key name="uniqueAtt"> <xs:selector xpath="."/> <xs:field xpath="@a1|@a2|@a3"/> </xs:key> </xs:element> Stan Kitsis Microsoft Corporation -----Original Message----- From: Howard Bartel [mailto:hbartel@c...] Sent: Monday, June 26, 2006 5:09 PM To: xml-dev@l... Subject: Restrictions on existence of attributes? How do I specify that an element MUST have ONLY ONE of a set of possible attributes? I understand that there is a "choice" option but it seems that this only applies to elements, not attributes within an element. Thanks, Howard ----------------------------------------------------------------- The xml-dev list is sponsored by XML.org <http://www.xml.org>, an initiative of OASIS <http://www.oasis-open.org> The list archives are at http://lists.xml.org/archives/xml-dev/ To subscribe or unsubscribe from this list use the subscription manager: <http://www.oasis-open.org/mlmanage/index.php>
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