[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: An element with more than one possible type
Hi Pau, It's not possible to do this exactly how you want. You could use schemas xsi:type mechanism to approximate it. In this case your last construct would be defined as: <xs:element name="items"> <xs:complexType> <xs:sequence> <xs:element name="item" type="itemType"/> </xs:sequence> </xs:complexType> </xs:element> and your XML instance would become: <items> <item xsi:type = "itemTypeWaterVolume" volume ="22"/> <item xsi:type = "itemTypeMeatWeight" weight = "10" /> </items> Although you could use simpler names if you like. (Also your restrictions to itemTypeMeat and so on would not be required.) You could also aim for something like: <items> <itemTypeWaterVolume volume ="22"/> <itemTypeMeatWeight weight = "10" /> </items> Other than that you would need something like Schematron (or wait for assertions to appear in XSD1.1!) HTH, Pete. -- ============================================= Pete Cordell Tech-Know-Ware Ltd for XML to C++ data binding visit http://www.tech-know-ware.com/lmx (or http://www.xml2cpp.com) ============================================= Original Message From: "pau carre" >I am trying to code a XML Schema (XSD file) for a web service in such a >way: > > <items> > <item name = "water" volume ="22"> > <item name = "meat" weight = "10" > > </items> > > It is to say, if name is "water" , then use the "volume" attribute. > When name is "meat" then use "weight" attribute. > > What I have done is to define a simple type for name attribute > > <xs:simpleType name="nameType"> > <xs:restriction base="xs:string"> > <xs:enumeration value="water"/> > <xs:enumeration value="meat"/> > </xs:restriction> > </xs:simpleType> > > Then I defined an abstract complex type for "item" element: > > <xs:complexType name="itemType" abstract = "true"> > <xs:attribute name = "name" type = "nameType"/> > </xs:complexType> > > I restricted the "name" attribute to "meat": > > <xs:complexType name="itemTypeWaterVolume"> > <xs:complexContent> > <xs:restriction base="itemType"> > <xs:attribute name = "name" type = "nameType" > fixed="meat"/> > </xs:restriction> > </xs:complexContent> > </xs:complexType> > > ... and finally I added an attribute "weight": > > <xs:complexType name="itemTypeMeatWeight"> > <xs:complexContent> > <xs:extension base="itemTypeMeat"> > <xs:attribute name = "weight" type = "xs:int"/> > </xs:extension> > </xs:complexContent> > </xs:complexType> > > For the "water" is the same as "meat". First I restricted the "name" > attribute to "water": > > <xs:complexType name="itemTypeWater"> > <xs:complexContent> > <xs:restriction base="itemType"> > <xs:attribute name = "name" type = "nameType" > fixed="water"/> > </xs:restriction> > </xs:complexContent> > </xs:complexType> > > ... and finally I added the "volume" attribute > > <xs:complexType name="itemTypeWaterVolume"> > <xs:complexContent> > <xs:extension base="itemTypeWater"> > <xs:attribute name = "volume" type = "xs:int"/> > </xs:extension> > </xs:complexContent> > </xs:complexType> > > The problem is to define the type for "item" element. If I use > "itemType" as type it the XML does not validated because > "itemType" is abstract. I I use: > > <xs:element name="items"> > <xs:complexType> > <xs:sequence> > <xs:choice> > <xs:element name="item" > type="itemTypeWaterVolume"/> > <xs:element name="item" > type="itemTypeMeatWeight"/> > </xs:choice> > </xs:sequence> > </xs:complexType> > </xs:element> > > the XML does not validate because the validator assumes that the > "item" type is the first defined (itemTypeWaterVolume). If I > change the declaration of "item" element then the validator > assumes that the type of "item" is "itemTypeMeatWeight". > > Do you know how to solve this problem? > > Thanks in advance. > > Pau > > _______________________________________________________________________ > > XML-DEV is a publicly archived, unmoderated list hosted by OASIS > to support XML implementation and development. To minimize > spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: xml-dev-unsubscribe@l... > subscribe: xml-dev-subscribe@l... > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php > >
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