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Recursive Data Models in XML: Building Relationship Structures

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Explore XML schemas for creating recursive relationships in data models. Learn how to define complex relationships between entities using XSD elements and types.

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Recursive Data Models in XML: Building Relationship Structures

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  1. Recursive relationship

  2. Data model

  3. <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified"> <xsd:element name="monarchs"> <xsd:complexType> <xsd:sequence> <xsd:element name="monarch" type="monarchType" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:complexType name="monarchType"> <xsd:sequence> <xsd:element name="monarchID" type="xsd:ID"/> <xsd:element name="monarchName" type="xsd:string"/> <xsd:element name="monarchNumber" type="xsd:string"/> <xsd:element name="monarchType" type="xsd:string"/> <xsd:element name="monarchBegin" type="xsd:date"/> <xsd:element name="predecessor" type="xsd:IDREF" minOccurs="0" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> </xsd:schema>

  4. <?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/xsl" href="president.xsl"?> <monarchs xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="monarch.xsd"> <monarch> <monarchID>m1</monarchID> <monarchName>William</monarchName> <monarchNumber>IV</monarchNumber> <monarchType>King</monarchType> <monarchBegin>1830-06-26</monarchBegin> </monarch> <monarch> <monarchID>m2</monarchID> <monarchName>Victoria</monarchName> <monarchNumber>I</monarchNumber> <monarchType>Queen</monarchType> <monarchBegin>1837-06-20</monarchBegin> <predecessor>m1</predecessor> </monarch> </monarchs>

  5. <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="unqualified"> <xsd:element name="employees"> <xsd:complexType> <xsd:sequence> <xsd:element name="employee" type="empType" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:complexType name="empType"> <xsd:sequence> <xsd:element name="empID" type="xsd:ID"/> <xsd:element name="empFirstName" type="xsd:string"/> <xsd:element name="empSalary" type="xsd:integer"/> <xsd:element name="subordinates" type="subType" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> <xsd:complexType name="subType"> <xsd:sequence> <xsd:element name="subordinate" type="xsd:IDREF"/> </xsd:sequence> </xsd:complexType> </xsd:schema>

  6. <?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/xsl" href="employee.xsl"?> <employees xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="employee.xsd"> <employee> <empID>e1</empID> <empFirstName>Alice</empFirstName> <empSalary>75000</empSalary> <subordinates> <subordinate>e2</subordinate> </subordinates> </employee> <employee> <empID>e2</empID> <empFirstName>Ned</empFirstName> <empSalary>45000</empSalary> <subordinates> <subordinate>e3</subordinate> </subordinates> <subordinates> <subordinate>e4</subordinate> </subordinates> </employee> <employee> <empID>e3</empID> <empFirstName>Andrew</empFirstName> <empSalary>25000</empSalary> </employee> <employee> <empID>e4</empID> <empFirstName>Clare</empFirstName> <empSalary>25000</empSalary> </employee> </employees>

  7. <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="unqualified"> <xsd:element name="products"> <xsd:complexType> <xsd:sequence> <xsd:element name="product" type="prodType" maxOccurs="unbounded"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:complexType name="prodType"> <xsd:sequence> <xsd:element name="prodID" type="xsd:ID"/> <xsd:element name="prodName" type="xsd:string"/> <xsd:element name="prodCost" type="xsd:decimal" minOccurs="0"/> <xsd:element name="prodPrice" type="xsd:decimal"/> <xsd:element name="components" type="componentsType" minOccurs="0" maxOccurs="1"/> </xsd:sequence> </xsd:complexType> <xsd:complexType name="componentsType"> <xsd:sequence> <xsd:element name="component" type="xsd:IDREF"/> <xsd:element name="componentqty" type="xsd:integer"/> </xsd:sequence> </xsd:complexType> </xsd:schema>

  8. <?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/xsl" href="product.xsl"?> <products xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="product.xsd"> <product> <prodID>p1000</prodID> <prodName>Animal photography kit</prodName> <prodPrice>725</prodPrice> <components> <component>p101</component> <componentqty>1</componentqty> </components> </product> <product> <prodID>p101</prodID> <prodName>Camera case</prodName> <prodCost>150</prodCost> <prodPrice>300</prodPrice> </product> </products>

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