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Bill,
If you want to use the same element name (<property> defined by different
types <DisplayPropertyType, ClassPropertyType etc. ) , you can define the
<propertyType> as an abstract type, then derive all desired types such as
<DisplayPropertyType>, <ClassPropertyType> etc.
In the instance document, you can use xsi:type to associate required type
with the <Property> element.
If you need more details, please let me know.
Cheers,
Nada Reinprecht
Information Services: Better Solutions for a Better Market
03 96488748
Bill Riegel
<BRiegel@lgc.com> To: xml-dev@lists.xml.org
cc:
05/02/2003 12:49 Subject: [xml-dev] misunderstanding of XML Schema ?
AM
Trying to define a base type of PropertyType,
And derived several types from this base type. Where the name element is
restricted to a fix list in each derived type.
Have a file that should have a list of these derived types in a specific
order.
In XML spy when I try to validate the file it complains that the second
Property entry does not have DisplayName, when it has a Type.
Why does it think all Property entires are DisplayPropertyType's ??
XML File
<ComponentRegistry>
<Components>
<Component name="DB Reader">
<ShowOnDemand>true</ShowOnDemand>
<Description>
Reads data from a database whose data model is supported by an
ObjectServer
</Description>
<Property>
<Constant>true</Constant>
<Name>DisplayName</Name>
<Value>DB Readerr</Value>
</Property>
<Property>
<Constant>true</Constant>
<Name>Type</Name>
<Value>ObjectServer Reader</Value>
</Property>
<Property>
<Constant>true</Constant>
<Name>Class</Name>
<Value>com.lgc.im.dataio.db.objectserver.ReaderImpl</Value>
</Property>
<Property>
<Constant>true</Constant>
<Name>Category</Name>
<Value>DataBase</Value>
</Property>
<Property>
<Constant>true</Constant>
<Name>Format</Name>
<Value>ObjectServer</Value>
</Property>
<Property>
<Constant>true</Constant>
<Name>Resource Class</Name>
<Value>com.lgc.im.dataio.db.objectserver.ResourceImpl</Value>
</Property>
</Component>
</Components>
</ComponentRegistry>
<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSPY v5 rel. 2 U (http://www.xmlspy.com) by James L.
Blunt (Landmark Graphics Corp.) -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; elementFormDefault="
qualified" attributeFormDefault="unqualified">
<xs:element name="ComponentRegistry">
<xs:annotation>
<xs:documentation>Comment describing your root element</
xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="Components">
<xs:complexType>
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="Component">
<xs:complexType>
<xs:sequence>
<xs:element name="ShowOnDemand" type="xs:boolean"/>
<xs:element name="Description" type="xs:string"/>
<xs:element name="Property" type="DisplayPropertyType
"/>
<xs:element name="Property" type="TypePropertyType"/>
<xs:element name="Property" type="ClassPropertyType"/>
<xs:element name="Property" type="CategoryPropertyType
"/>
<xs:element name="Property" type="FormatPropertyType"/>
<xs:element name="Property" type="
ResourceClassPropertyType"/>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="required
"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="PropertyType">
<xs:sequence>
<xs:element name="Constant" type="xs:boolean" minOccurs="0"/>
<xs:element name="Name" type="xs:string"/>
<xs:element name="Value" type="xs:string"/>
<xs:element name="InVisible" type="xs:boolean" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="DisplayPropertyType">
<xs:complexContent>
<xs:restriction base="PropertyType">
<xs:sequence>
<xs:element name="Constant" type="xs:boolean" minOccurs="0"/>
<xs:element name="Name">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="DisplayName"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Value" type="xs:string"/>
<xs:element name="InVisible" type="xs:boolean" minOccurs="0"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="TypePropertyType">
<xs:complexContent>
<xs:restriction base="PropertyType">
<xs:sequence>
<xs:element name="Constant" type="xs:boolean" minOccurs="0"/>
<xs:element name="Name">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="Type"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Value" type="xs:string"/>
<xs:element name="InVisible" type="xs:boolean" minOccurs="0"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="ClassPropertyType">
<xs:complexContent>
<xs:restriction base="PropertyType">
<xs:sequence>
<xs:element name="Constant" type="xs:boolean" minOccurs="0"/>
<xs:element name="Name">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="Class"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Value" type="xs:string"/>
<xs:element name="InVisible" type="xs:boolean" minOccurs="0"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="CategoryPropertyType">
<xs:complexContent>
<xs:restriction base="PropertyType">
<xs:sequence>
<xs:element name="Constant" type="xs:boolean" minOccurs="0"/>
<xs:element name="Name">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="Category"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Value" type="xs:string"/>
<xs:element name="InVisible" type="xs:boolean" minOccurs="0"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="FormatPropertyType">
<xs:complexContent>
<xs:restriction base="PropertyType">
<xs:sequence>
<xs:element name="Constant" type="xs:boolean" minOccurs="0"/>
<xs:element name="Name">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="Format"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Value" type="xs:string"/>
<xs:element name="InVisible" type="xs:boolean" minOccurs="0"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="ResourceClassPropertyType">
<xs:complexContent>
<xs:restriction base="PropertyType">
<xs:sequence>
<xs:element name="Constant" type="xs:boolean" minOccurs="0"/>
<xs:element name="Name">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="Resource Class"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Value" type="xs:string"/>
<xs:element name="InVisible" type="xs:boolean" minOccurs="0"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
</xs:schema>
Bill Riegel
LandMark Graphics
713-839-3388
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