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This is explained with an example. Screenshot of the sample Sample schema used is shown as provided below.:
Figure 1: Schema with derived types
| Code Block | ||
|---|---|---|
| ||
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.books.org" targetNamespace="http://www.books.org" elementFormDefault="qualified">
<xsd:complexType name="Publication">
<xsd:sequence>
<xsd:element name="Title" type="xsd:string" />
<xsd:element name="Author" type="xsd:string" />
<xsd:element name="date" type="xsd:gYear" />
</xsd:sequence>
</xsd:complexType>
<xsd:element name="SamplePublication" type="Publication" />
<xsd:complexType name="BookPublication">
<xsd:complexContent>
<xsd:extension base="Publication">
<xsd:sequence>
<xsd:element name="ISBN" type="xsd:string" />
<xsd:element name="Publisher" type="xsd:string" />
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="PaperPublication">
<xsd:complexContent>
<xsd:restriction base="Publication">
<xsd:sequence>
<xsd:element name="Date" type="xsd:gYear" />
<xsd:element name="Location" type="xsd:string" />
</xsd:sequence>
</xsd:restriction>
</xsd:complexContent>
</xsd:complexType>
</xsd:schema> |
The schema provided above contains an element SamplePublication of type Publication. The type Publication has two derived types: BookPublication (extension) and PaperPublication (restriction). When the schema is loaded in Mapper, the element SamplePublication is shown in Mapper.
Figure 21: Sample Publication with default type
Since the type Publication has derived types, user can change the type of the element SamplePublication. All the derived types will be shown when right-clicked on the SamplePublication element and the user can select the required derived type as shown in the figure below.
Figure 32: Available derived types
When a different type is selected, the structure will be refreshed to show the selected type.
Figure 43: SamplePublication element when BookPublication type is chosen
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