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<myC:state>Ohio</myC:state> <myC:postal-code>45565</myC:postal-code> </myC:address>
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This namespace declaration binds the namespace prefix myC to the namespace URI http://myCompany.com/hr/employees. Because all elements are prefixed with myC, they all belong to the namespace URI. There is another way to declare and use a namespace that does not employ a prefix. It is called a default namespace. The following is an example of a default namespace declaration:
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<address xmlns="http://myCompany.com/hr/employees">
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In this case, the attribute xmlns provides a default name for the namespace in its attribute value. The use of the default declaration of the namespace is demonstrated in Listing 11-4. Figure 11.4 shows a schematic view of the listing. All subordinate elements are assumed to belong to the default namespace, provided they are not prefixed with a reference to another namespace URI or do not declare a default namespace of their own.
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Listing 11-4
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Listing 11.4: Use of default namespace declaration 1 <address xmlns= "http://myCompany.com/hr/employees" 2 <name>John Smith</name> 3 <street>45 Walcut St</street> 4 <city>Dublin</city> 5 <state>Ohio</state> 6 <postal-code>45565</postal-code> 7 </address>
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XML Schemas An XML schema defines the grammar and structure of XML instance documents of a particular type. An XML schema is itself an XML instance. The top element of a schema is named schema. The namespace for
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xmlns= http://myCompany.com/hr/employees address
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name
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city
state
postal-code
Schematic view of Listing 11-4
Eleven
a schema definition is http://www.w3.org/2001/XMLSchema, which is linked to the prefix xsd. Note that this namespace prefix is conventionally used to denote XML schema definitions. In principle, any other prefix could be used as well. The following shows the top element named schema:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> . . . </xsd:schema>
The schema element can contain several subordinate element types, such as the following:
element attribute simpleType complexType include import
The relationship to the top schema element is shown in Figure 11.5. Here s a brief description of these subelements of the top element schema:
element This subelement declares an element used in an XML instance. A declaration includes the name and type. attribute This subelement declares an attribute used in an XML instance. A declaration includes the name and type. simpleType This subelement de nes a simple type. A simple type in an XML schema is a built-in type, a list of simple types, a union of simple types, or a restriction of a simple type.
Schema
element
attribute
simpleType
complexType
Basic elements of an XML schema
complexType This subelement de nes a complex type. The complex type de nition typically contains XML elements and carries attributes. The elements appearing in a complex type are declared or referenced within the type de nition. Attributes appearing in a complex type similarly are declared within the type de nition. include This subelement is used to import an element de nition de ned in another schema. The other schema must belong to the same XML namespace. import This subelement is used to import an element de nition de ned in another schema that belongs to a different namespace. Through the use of include and import, reuse is possible with XML schema de nitions.
Out of these subelements, probably the most important type is the complexType. The structure of this subelement is shown in Figure 11.6. The complexType can have any number of attributes but can have only one of the following: sequence, all, choice, or group. Under sequence, we can have any number of elements, but these elements must appear in the specific order. In case of all, we can have any number of elements. All these elements must appear, but the order is not important. In case of choice, only one of the allowed elements can appear in an XML instance. An example of the complex element types is shown in Listing 11-5.
complexType n 0..1 0..1 0..1 all n element 0..1 choice n element Mandatory Optional Exclusive
attribute
sequence n element
group
Structure of XML complex type
Eleven
Listing 11-5
Listing 11.5: An example of a complexType 1 <xsd:complexType name="nameType"> 2 <xsd:sequence> 3 <xsd:element name="title" type="xsd:string"> 4 <xsd:element name="firstName" type="xsd:string"> 5 <xsd:element name="middleName" type="xsd:string"> 6 <xsd:element name="lastName" type="xsd:string"> 7 </xsd:sequence> 8 </xsd:complexType>
A complete sample schema is shown in Listing 11-6.
Listing 11-6
Listing 11.6: An example of a complete schema 1 < xml version="1.0" encoding="UTF-8"> 2 <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 3 targetNamespace="http://simple.example.com/CInfoXmlDoc" 4 xmlns="http://simple.example.com/CInfoXmlDoc 5 elementFormDefault="qualified" 6 <xsd:complexType> 7 <xsd:sequence> 8 <xsd:element name="Name" type="xsd:string/> 9 <xsd:element name="Address"> 10 <xsd:complexType> 11 <xsd:sequence> 12 <xsd:element name="Street" 13 type="xsd:string"/> 14 <xsd:element name="City" 15 type="xsd:string" /> 16 <xsd:element name="State" 17 type="xsd:string" /> 18 <xsd:element name="Country" 19 type="xsd:string" /> 20 </xsd:sequence> 21 </xsd:complexType> 22 </xsd:element> 23 <xsd:element name="HomePhone" type="xsd: string" /> 24 <xsd:element name="Email" type="xsd:string" /> 25 </xsd:sequence> 26 </xsd:complexType> 27 </xsd:schema>
A sample XML instance that conforms to this schema is given in Listing 11-7.
Listing 11-7
Listing 11.7: An example XML instance document that conforms to schema in Listing 10.6 1 < xml version='1.0' encoding='UTF-8' > 2 <ContactInformation 3 xmlns='http://simple.example.com/CInfoXmlDoc' 4 xmlns:xsi:'http://www.w3.org/2001/XMLSchema-instance' 5 xsi:schemaLocation='http://simple.example.com/ CinfoXmlDoc 6 file:./CInfoXmlDoc.xsd'> 7 <Name>John Smith</Name> 8 <Address> 9 <Street>45 Walcut St</Street> 10 <City>Dublin</City> 11 <State>Ohio</State> 12 <Country>USA</Country> 13 </Address> 14 <HomePhone>9891234567</HomePhone> 15 <Email>xyz@abc.com</Email> 16 </ContactInformation>
XML Processing/Parsing Models A common way for Web Services interaction to the exchange of data between the service provider and service consumer application is through XML instance documents. A number of processing models are available for the applications to use when dealing with the information contained in an XML document instance. In the case of Java/J2EE applications, five choices are available for XML processing models:
SAX The Simple API for XML is an event-driven parsing/programming model. StAX The Streaming API for XML provides a pull, event-based parsing/programming model. DOM The Document Object Model provides an in-memory treetransversal programming model. XML data-binding Provides an in-memory Java content classbound programming model. XSLT Extensible Stylesheet Language Transformation provides a template-based programming model.
The most common processing models have been SAX and DOM, but StAX is quickly catching up. These three methods, along with XSLT, are
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