RE: XML schema -- specify a relationship between attributes?
W3C Schema does not have the capability to satisy your requirement - which is commonly known as a "co-occurrence constraint" requirement. Your next options would be to consider using Schematron, or to use programmatic means for this validation. Kind Regards, Joseph Chiusano Booz Allen Hamilton Strategy and Technology Consultants to the World > -----Original Message----- > From: Stewart Johnson [mailto:stew@f...] > Sent: Monday, November 22, 2004 2:55 PM > To: xml-dev@l... > Subject: XML schema -- specify a relationship > between attributes? > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hey All - > > I hope this is an appropriate place for this question. > > I'm stuck while trying to write a schema, hoping someone can > provide me with a flash of inspiration. > > One of the elements I'm specifying has two attributes, both > of which are optional. I want to express in the schema that > there's a relationship between the two -- that the second > attribute is optional only if the first one is not specified. ie: > > <myElement /> <!-- valid --> > <myElement name="A" /> <!-- valid --> > <myElement myattr="true" /> <!-- invalid because name isn't > specified --> <myElement myattr="true" name="A" /> <!-- valid --> > > So far my schema looks like this: > > <element name="myElement"> > <complexType> > <attribute name="name" type="string" use="optional" /> > <attribute name="myattr" type="boolean" > use="optional" default="false" /> > </complexType> > </element> > > That captures the default values and the optional nature of > the two elements, but it doesn't capture the relationship > between the two. Is there any xsd construct I can use to > express the relationship? I know how to do it with elements > (xsd:group, xsd:choice) but not with attributes. > > Thanks for any thoughts. > > Stewart > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.2.5 (MingW32) > Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org > > iD8DBQFBokQaBGGH+7lrhRgRAk+oAKC4+mR5pnr++zBCskuxg0O2YaX8rQCeKELI > zJXUZ6AgGo9ys5L9oN/mSHw= > =jufi > -----END PGP SIGNATURE----- > > ----------------------------------------------------------------- > 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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