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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Looking for an example of a name colliision
 <Quote> in any document using the a1 vocabulary, how can "StateCode" in the sense of the a2 vocabulary be used? Well, just use it! </Quote> I think I should be a bit clearer: In my example, the element "StateCode" (a US state and the state of a chemical element) was referenced twice, and in each reference it was in 2 separate namespaces. If the 2 schemas (agency 1 and agency 2) shared the same namespace (perhaps an overall "superagency" namespace), then name collision would occur. My example was intended to demonstrate a case in which namespaces prevented element name collision (and I think/hope it did). Kind Regards, Joe Chiusano Booz | Allen | Hamilton Arjun Ray wrote: > > "Chiusano Joseph" <chiusano_joseph@b...> wrote: > > | <Quote> > | could you then provide us an instance illustration? > | </Quote> > | > | Sure - here it is. This is an agency's schema (agency 1) that includes > | the vocabulary of agency 2. > > Name collision at the *schema definition* level!? This kind of thing was > solved by ArchForms years ago. You might even say that this was exactly > why ArchForms were invented! See, eg, > > http://www.isogen.com/papers/archintro.htm > > | <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" > | xmlns:a1="http://www.agency1.gov" > | xmlns:a2="http://www.agency2.gov" > | targetNamespace="http://www.agency1.gov" > | elementFormDefault="qualified"> > | > | ...[import of agency 2's schema goes here]... > | > | <xsd:element name="Address"> > | <xsd:complexType> > | <xsd:sequence> > | <xsd:element ref="a1:Street"/> > | <xsd:element ref="a1:City"/> > | <xsd:element ref="a1:StateCode"/> > | <xsd:element ref="a1:ZipCode"/> > | <xsd:element ref="a1:Country"/> > | </xsd:sequence> > | </xsd:complexType> > | </xsd:element> > > Or, for people who can sleep at night without a steady diet of pointy > brackets: > > <!ELEMENT Address (Street, City, StateCode, ZipCode, Country) > > > | <xsd:element name="ElementInformation"> > | <xsd:complexType> > | <xsd:sequence> > | <xsd:element ref="a2:Name"/> > | <xsd:element ref="a2:StateCode"/> > | ...[more stuff here]... > | </xsd:sequence> > | </xsd:complexType> > | </xsd:element> > > <?IS10744:arch name="http://www.agency2.gov" > form-att="a2" ?> > > <!ELEMENT ElementInformation (Foo, Bar) > > <!ATTLIST Foo a2 NAME #FIXED "Name" > > <!ATTLIST Bar a2 NAME #FIXED "StateCode" > > > For a demonstration of how this particular usecase was a non-problem even > before the colonification bogosity was invented: > > http://www.nyct.net/~aray/sgml/demo/dept/ > > But that's using old-fashioned tools. As I understand this example, the > point seems to be: in any document using the a1 vocabulary, how can > "StateCode" in the sense of the a2 vocabulary be used? Well, just use it! > Simply annotate the use with an attribute saying "Oh by the way, this is > in the a2 sense". > > Perhaps you mean that your *tools* have been coded to robotically examine > GIs only? > > Well, that's a problem with the tools, not the formalism, no? > > ----------------------------------------------------------------- > 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://lists.xml.org/ob/adm.pl> begin:vcard n:Chiusano;Joseph tel;work:(703) 902-6923 x-mozilla-html:FALSE url:www.bah.com org:Booz | Allen | Hamilton;IT Digital Strategies Team adr:;;8283 Greensboro Drive;McLean;VA;22012; version:2.1 email;internet:chiusano_joseph@b... title:Senior Consultant fn:Joseph M. Chiusano end:vcard 
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