- From: Ashok Malhotra <ashokma@microsoft.com>
- Date: Thu, 31 Jan 2002 08:14:35 -0800
- To: "Paul Kiel" <paul@xmlhelpline.com>, <xmlschema-dev@w3.org>
- Message-ID: <E5B814702B65CB4DA51644580E4853FB019EE824@red-msg-12.redmond.corp.microsoft.com>
The XML Schema datatypes spec does say in 2.5.1.3 that: Any number (greater than 1) of *atomic* <http://www.w3.org/TR/xmlschema-2/#dt-atomic#dt-atomic> or *list* <http://www.w3.org/TR/xmlschema-2/#dt-list#dt-list> *datatype* <http://www.w3.org/TR/xmlschema-2/#dt-datatype#dt-datatype> s can participate in a *union* <http://www.w3.org/TR/xmlschema-2/#dt-union#dt-union> type. Note, atomic or list datatypes, not atomic, list or union datatypes. All the best, Ashok =========================================================== Ashok Malhotra <mailto: ashokma@microsoft.com <mailto:%20ashokma@microsoft.com> > Microsoft Corporation 212 Hessian Hills Road Croton-On-Hudson, NY 10520 USA Redmond: 425-703-9462 New York: 914-271-6477 -----Original Message----- From: Paul Kiel [mailto:paul@xmlhelpline.com] Sent: Thursday, January 31, 2002 7:38 AM To: xmlschema-dev@w3.org Subject: union of a union legal? In running some schemas through my various array of tools, I came across an issue that needs clarification. If I defined two simpleTypes that are unions, can I use one as a memberType of the other? I know a union cannot be in a list, but can a union be in a union? Here is an example: <xsd:simpleType name="OneType"> <xsd:union memberTypes="Type1 Type2 Type3"/> </xsd:simpleType> <xsd:simpleType name="OtherType"> <xsd:union memberTypes="OneType Type4 Type5"/> </xsd:simpleType> My first inclination was yes, based on this sentence from the schema spec: 4.1.2.3 Derivation by union "A *union* datatype can be *derived* from one or more *atomic*, *list* or other *union* datatypes, known as the *memberTypes* of that *union* datatype." I am however getting an error using Topologi (which uses msxml4 under the hood if memory serves) and get the error: "Union datatypes must be derived from an atomic or list datatype." This error made me think that I had read something along those lines before in the spec, but alas I cannot find it. Many thanks for your comments, Paul Kiel W. Paul Kiel Chief Architect HR-XML Consortium 919-846-0224 paul@hr-xml.org
Received on Thursday, 31 January 2002 11:15:12 UTC