[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: How to Unique contraint
Hi, It's not valid because the field xpath is only allowed to return zero or one node relative to the selector xpath, and in this case it would return two. (Validation Rule: Identity-constraint Satisfied, part #3) [1]. I can't think of a way to do this with the XML you've got, but if you changed the attributes into child elements, as in: <anElement> <port>123</port> <debug-port>aaa</debug-port> </anElement> <anElement> <port>abc</port> <debug-port>123</debug-port> </anElement> you could use: <xs:unique name="port"> <xs:selector xpath="anElement/port|anElement/debug-port"/> <xs:field xpath="."/> </xs:unique> (You can't use anElement/@port|anElement/@debug-port in the selector because you are not allowed to use the attribute axis in the selector.) Hope that (sort of) helps, Priscilla ------------------------------------ Priscilla Walmsley Author, Definitive XML Schema http://www.datypic.com ------------------------------------ [1] http://www.w3.org/TR/xmlschema-1/#cvc-identity-constraint > -----Original Message----- > From: Michael Kay [mailto:mike@s...] > Sent: Wednesday, March 21, 2007 2:11 PM > To: smcardle@s...; xml-dev@l... > Subject: RE: How to Unique contraint > > > > > Does anybody know how to do this so it looks something like > > the following INVALID constraint, but I hope you get the picture. > > > > <xs:unique name="port"> > > <xs:selector xpath="anElement"/> > > <xs:field xpath="@debug-port | @port"/> </xs:unique> > > > > What makes you think this constraint is invalid? It looks OK to me. > > Michael Kay > http://www.saxonica.com/ > > > ______________________________________________________________ > _________ > > XML-DEV is a publicly archived, unmoderated list hosted by OASIS > to support XML implementation and development. To minimize > spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: xml-dev-unsubscribe@l... > subscribe: xml-dev-subscribe@l... > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php > > >
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] |
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|