xml relational databases | xml data management 2903

Relationships: modeling relational data in XML, part 3

The next approach uses named complex types and then generates the element structures from them. In this example, the types are typically declared together at the beginning of the document and then referenced later on. Our example formulated this way looks like this:


<xsd:schema

    xmlns:xsd="http://www.w3.org/2001/XMLSchema">


     <xsd:complexType name="customerElement">


     <xsd:sequence>


     <xsd:element name="Invoice" type="invoiceElement"

    maxOccurs="unbounded" />


     </xsd:sequence>


     </xsd:complexType>


     <xsd:complexType name="invoiceElement">


     <xsd:sequence>


     <xsd:element name="LineItem" maxOccurs="unbounded"

    />


     </xsd:sequence>


     </xsd:complexType>


     <xsd:element name="Customer" type="customerElement"

    />


    </xsd:schema>

In this model, each element is declared separately. However, the model of the element content (the complexType) is declared independently of the element name (the element declaration itself). This can lead to some headaches if elements with matching names have different content models. The third approach resolves this by using global element declarations, referenced using the ref attribute on the actual element declarations:


<xsd:schema

    xmlns:xsd="http://www.w3.org/2001/XMLSchema">:


     <xsd:element name="Customer">:


     <xsd:complexType>:


     <xsd:sequence>:


     <xsd:element ref="Invoice" maxOccurs="unbounded"

    />:


     </xsd:sequence>:


     </xsd:complexType>:


     </xsd:element>:


     <xsd:element name="Invoice">:


     <xsd:complexType>:


     <xsd:sequence>:


     <xsd:element ref="LineItem" maxOccurs="unbounded"

    />:


     </xsd:sequence>:


     </xsd:complexType>:


     </xsd:element>:


     <xsd:element name="LineItem" />:


    </xsd:schema>:

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Relationships: modeling relational data in XML, part 3

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