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Overview XML has been adopted as a popular middleware-independent standard format for the exchange of data and documents. In addition, XML forms the basis for the other three standards relating to Web Services mentioned previously. This is shown schematically in Figure 11.1. XML syntax is similar to HTML, but it serves a different purpose than that of HTML. HTML is a language used to describe how the data should be displaced. On the other hand, XML is designed to describe what the data is. Just as in HTML, there are tags in XML. However, in XML, tags describe what the data is instead of how data should be displayed, as is the case for HTML. A sample portion of an XML document is shown in Listing 11-1.
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Listing 11-1
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Listing 11.1: Sample XML code snippet 1 <product> 2 <name>Blue Device</name> 3 <price currency="US">99.99</price> 4 </product>
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Another important difference between XML and HTML is that XML does not force the use of specific tag names, thus allowing programmers to invent their own tags. The following phrases are used in conjunction with tags :
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Open tags Close tags Elements
Example: <name> Example: </name> Example: <name>Blue Device</name>
Attributes Example: <price currency="US"> The general structure of an XML document is shown in Figure 11.2.
Document
1 Element n n Attribute
1 Data
The general structure of an XML document
This figure shows that a basic XML document consists of a top element. Note that there can only be one top element in a valid XML document. This top element may consist of data (the payload), an attribute, and any number of other elements in a recursive manner. A sample portion of a simple XML document is shown in Listing 11-2. This document contains a top element named address, which has a single attribute used to specify the country. This top element has also five child elements, which provide information on the name of the person, the street address, the city, and the postal code. Each of these child elements has data (that is, a payload) contained in them. For example, the data for the name element is John Smith.
Listing 11-2
Listing 11.2: Basic XML document structure 1 <address country="USA"> 2 <name>John Smith</name> 3 <street>43 Walcut St</street> 4 <city>Dublin</city> 5 <state>Ohio</state> 6 <postal-code>45561</postal-code> 7 </address>
XML Namespaces The namespace is an important concept in XML, and we will employ this feature as a technique to increase reuse across multiple WSDL documents and across the enterprise and beyond. Therefore, we ll describe this concept and discuss how this concept is implemented. An XML namespace comprises a collection of element type names and attribute names. A namespace is identified by a URI reference. As an example, consider the three different namespaces shown in Figure 11.3.
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http:/myCompany.com/hr/employees <employee-id>, <department-number>, <name>, <address>
http:.//myCompany.com/sales/orders <order>, <order-number>, <order-date>, <name>, <address>
http;//theClub.com/members <member>, <member-id>, <member-since>, <name>, <address>
Namespaces
The element s name and the address of the namespace (http:/myCompany .com/hr/employees) refer to the names and addresses of the employees of the company (myCompany). The identical element type name of the namespace http:.//mCompany.com/sales/orders holds the name for the supplier for myCompany. Finally, myCompany s tennis club management also decides to store their member data in XML format with the element types of name and address. A namespace is declared through the reserved namespace attribute xmlns or through an attribute that is prefixed with xmlns: and followed by a name without a colon. The namespace attribute can be provided in any element of an XML document. The value of the namespace attribute is the namespace name (that is, the URI reference). An example of a namespace prefix declaration is shown here:
<address xmlns:myC="http://myCompany.com/hr/employees">
Now we can use the prefix to qualify any name of the element. A more complete example of the use of the prefix is shown in Listing 11-3.
Listing 11-3
Listing 11.3: Example of the use of a namespace prefix 1 <myC:address xmlns:myC="http://myCompany.com/hr/employees"> 2 <myC:name>John Smith</myC:name> 3 <myC:street>43 Walcut St</myC:street> 4 <myC:city>Dublin</myC:city>
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