Re: Schema validation question
Bob Foster wrote: > > This would be trivial to do in RELAX NG, but why do it? If the value of > one element is fixed by the name of another, then the value is redundant > and may be omitted. How would you then pass that value on to the next system/process if it is omitted? The subsequent processing might depend on that value being there - and you may not be able to (for whatever reason) enhance the subsequent system/process to "inherently" recognize that value. Kind Regards, Joe Chiusano Booz | Allen | Hamilton Strategy and Technology Consultants to the World > Such a thing is only useful for producing error > messages. > > Bob Foster > > Linda Grimaldi wrote: > > I have been out of the XML world for a little while now, but someone just asked me a question and I have to admit, it's going to keep me up tonight if I can't come up with a better solution. And I'm a little rusty, to boot... > > > > The issue is one of data dependency and validation. The goal is to enforce a restriction on pairs of data values- if the data associated with the node <Fruit><Name> is "Apple", then the value of the sibling node <Fruit><Abbrev> must be "APL". Effectively, the goal is to enforce a specific mapping from one enum into another within an XML document. The only way my associate could figure to capture this dependency is as follows: > > > > <xs:complexType name="Fruit"> > > <xs:annotation> > > <xs:documentation>Defines the valid values for fruit types</xs:documentation> > > </xs:annotation> > > <xs:choice> > > <xs:element name="APL" type="xs:token" fixed="Apple"/> > > <xs:element name="ORG" type="xs:token" fixed="Orange"/> > > <xs:element name="BAN" type="xs:token" fixed="Banana"/> > > <xs:element name="LEM" type="xs:token" fixed="Lemon"/> > > <xs:element name="GRP" type="xs:token" fixed="Grape"/> > > </xs:choice> > > </xs:complexType> > > > > All in all, this strikes me as a very ugly, even offensive, solution. My initial response was to forget about the validation- it wasn't worth it. Is there a way to preserve the data dependency validation without warping the instance document as the above schema fragment would require? > > > > Thanks, > > Linda > > ----------------------------------------------------------------- > 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> -- Kind Regards, Joseph Chiusano Associate Booz | Allen | Hamilton
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