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Naturally, before these prefixes can be used, they have to be defined. The root element of the following document contains three
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XML Support in SQL Server 2000
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attributes. Each of them specifies a namespace and a prefix used to reference it:
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<PurchaseOrders xmlns:contact="http://www.trigonblue.com/schemas/Contact.xml" xmlns:Company="http://www.trigonblue.com/schemas/Company.xml" xmlns:dsig="http://dsig.org"> <PurchaseOrder> <Customer> <contact:name>Tom Jones</contact:name> </Customer> <PurchaseDate>2000-09-11</PurchaseDate> <SalesOrganization> <Company:name>Trigon Blue</Company:name> <Company:DUNS>817282919</Company:DUNS> <Company:ID>1212</Company:ID> </SalesOrganization> <dsig:digital-signature>78901314</dsig:digital-signature> </PurchaseOrder> </PurchaseOrders>
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XML Parsers and DOM
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Applications (or user agents) that use XML documents can use proprietary procedures to access the data in them. Usually, such applications use special components called XML parsers. An XML parser is a program or component that loads the XML document into an internal hierarchical structure of nodes (see Figure 12-1) and provides access to the information stored in these nodes to other components or programs. The XML Document Object Model (DOM) is a set of standard objects, methods, events, and properties used to access elements of an XML document. DOM is a standard that has received Recommended status from W3C. Different software vendors have created their own implementations of DOM so that you can use it from (almost) any programming language on (almost) any platform.
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Figure 12-1.
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A possible graphical interpretation of a node tree
Microsoft has implemented DOM as a COM component called Microsoft.XMLDOM in msxml.dll. It is delivered, for example, with Internet Explorer 5, or you can download it separately from Microsoft s Web site. Developers can use it from any programming language that can access COM components or ActiveX objects such as Visual Basic, VBScript, Visual J++, Jscript, and Visual C++. Nevertheless, it is unlikely that you will use it from Transact-SQL. Microsoft has built special tools for development in Transact-SQL. We will review them later in this chapter.
Linking and Querying in XML
XML today represents more than a simple language for encoding documents. W3C is working on a whole other set of specifications for using information in XML documents. Specifications such as XLink, XPointer, XPath, and XQL allow querying, linking, and access to specific parts of an XML document.
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This is a vast topic, and we will briefly review only XPointer and XPath, since they are used in SQL Server 2000.
XPointer
The XPointer reference works in a fashion very similar to the HTML hyperlink. You can point to a segment of an XML document by appending an XML fragment identifier to the URI of the XML document. A fragment identifier is often enclosed in xpointer(). For example, the following pointer directs the parser to an element with the ID attribute set to Toshiba in the document at a specified location:
http://www.trigonblue.com/xml/Equipment.xml#xpointer(Toshiba)
The character # is a fragment specifier. It serves as a delimiter between the URI and the fragment identifier, and it specifies the way that the XML parser will render the target. In the preceding case, the parser renders the whole document to access only a specified fragment. To force the parser to parse only the specified fragment, you should use | as a fragment specifier:
http://www.trigonblue.com/xml/Equipment.xml|xpointer(Toshiba)
Use of the | fragment specifier is recommended, as it leads to reduced memory usage. xpointer() is not always required. If a document has a schema that specifies the ID attribute of an element, you can omit the xpointer() and point to a fragment of the document using only the ID attribute value:
http://www.trigonblue.com/xml/Equipment.xml#Toshiba
Child sequence fragment identifiers use numbers to specify a fragment:
http://www.trigonblue.com/xml/Equipment.xml#/2/1/3
The preceding example should be interpreted as follows: / start from the top element of the document; 2 then go to the second child element of the top element; 1 then go to the first subelement of that element; 3 then go to the third subelement of that element.
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Child sequence fragment identifiers do not have to start from the top element:
http://www.trigonblue.com/xml/Equipment.xml#Toshiba/1/3
In the preceding example, fragment identification starts from the element with its ID set to Toshiba . The parser then finds its first subelement and points to its third subelement.
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