[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: XML schema cos-nonambig problem
Sure - the issue here is that when the XML schema processor encounters a "major" element, it has no way of determining (without doing a "look-ahead") which "choice" set is used. The fact that it has to look ahead (which W3C schema processors cannot do) means that there is non-determinism. However, if the complex type were changed to look as follows: > >> <xs:complexType name="contentiddef"> > >> <xs:choice> > >> <xs:choice minOccurs="0" maxOccurs="unbounded"> > >> <xs:element ref="x:externalid"/> > >> <xs:element ref="x:major"/> > >> </xs:choice> > >> <xs:choice minOccurs="0" maxOccurs="unbounded"> > >> <xs:element ref="x:major"/> > >> <xs:element ref="x:minor"/> > >> <xs:element ref="x:version"/> > >> </xs:choice> > >> </xs:choice> > >> </xs:complexType> the XML schema processor would know which choice set it is in when it encounters a "major" element because if it first encountered an "externalID" element (which must remain mandatory - as it is above - in order for this to work) it knows that it must be in the first choice set; otherwise, it must be in the second. Hope that helps, Joe Joseph Chiusano Associate Booz Allen Hamilton 700 13th St. NW, Suite 1100 Washington, DC 20005 O: 202-508-6514 C: 202-251-0731 Visit us online@ http://www.boozallen.com > -----Original Message----- > From: Niels Peter Strandberg [mailto:nielspeter@n...] > Sent: Friday, December 16, 2005 11:14 AM > To: xml-dev@l... > Subject: Re: XML schema cos-nonambig problem > > Im not sure what you mean! Could you show me, on the xml > snippet below? > > Niels Peter > > > Den 16/12/2005 kl. 17.03 skrev Chiusano Joseph: > > > In your first choice set, if you reverse the 2 elements that will > > remove the non-determinism - but only if the "externalid" element > > remains declared as mandatory. > > > > Joe > > > > Joseph Chiusano > > Associate > > Booz Allen Hamilton > > > > 700 13th St. NW, Suite 1100 > > Washington, DC 20005 > > O: 202-508-6514 > > C: 202-251-0731 > > Visit us online@ http://www.boozallen.com > > > > > >> -----Original Message----- > >> From: Niels Peter Strandberg [mailto:nielspeter@n...] > >> Sent: Friday, December 16, 2005 10:53 AM > >> To: xml-dev@l... > >> Subject: XML schema cos-nonambig problem > >> > >> This error message below is reported back from Xerces. The > problem is > >> the "major" element. How can I reconstruct my XML Schema so that I > >> can avoid this error? > >> > >> cos-nonambig: > >> "http://www.polopoly.com/polopoly/cm/app/xml":major and > >> "http://www.polopoly.com/polopoly/cm/app/xml":major (or > elements from > >> their substitution group) violate "Unique Particle Attribution". > >> During validation against this schema, ambiguity would be > created for > >> those two particles. > >> > >> > >> <xs:complexType name="contentiddef"> > >> <xs:choice> > >> <xs:choice minOccurs="0" maxOccurs="unbounded"> > >> <xs:element ref="x:major"/> > >> <xs:element ref="x:externalid"/> > >> </xs:choice> > >> <xs:choice minOccurs="0" maxOccurs="unbounded"> > >> <xs:element ref="x:major"/> > >> <xs:element ref="x:minor"/> > >> <xs:element ref="x:version"/> > >> </xs:choice> > >> </xs:choice> > >> </xs:complexType> > >> > >> Thanks! > >> > >> Niels Peter > >> > >> > >> ----------------------------------------------------------------- > >> 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> > >> > >> > > > ----------------------------------------------------------------- > 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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