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CHAPTER
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ML and its related technologies are major foundations of both the Internet and .NET. How much about XML you need to know depends on what kind of programming you do you might not need to know anything about it. However, you ll be doing yourself a disservice if you don t learn at least something about XML, and the more you know about it the more valuable you can be to a database programming team. Our goal here is to introduce you to the most essential XML concepts and terminology and the most basic techniques for using XML with SQL Server. This will enable you to handle the most common programming tasks and to learn more about XML quickly as the need arises. In this chapter, we ll cover: What XML is How to generate XML from tables with T-SQL s TO XML clause How to query XML documents with T-SQL s OPENXML function How to store and retrieve XML documents using the xml data type
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Extensible Markup Language (XML) is a metalanguage. A metalanguage isn t used for programming, but for defining other languages, and the languages XML defines are known as markup languages. Markup is exactly what it implies: a means of marking up something. You create XML documents by marking up data; that is, enclosing data between start tags and end tags. The elements you define by your tags (and your choice of tags is arbitrary) form a hierarchy, so XML documents organize data into parent-child relationships. XML documents are text documents readable by both humans and computers.
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CHAPTER 17 s USING XML
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s Note In essence, each XML document is an instance of a language defined by the XML elements used in
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the document. The specific language might or might not have been explicitly defined, but professional use of XML demands carefully planning one s XML vocabulary and specifying its definition in a schema that can be used to validate that documents adhere to both the syntax and semantics of a vocabulary. The XML Schema Definition Language (usually referred to as XSD) is the language for defining XML vocabularies.
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XML was developed by the World Wide Web Consortium (W3C) in 1996. Intended to support a wide variety of applications, it was used by the W3C to create XHTML (which is an XML vocabulary). Since 1996 a variety of other XML-oriented technologies have been developed by the W3C, including Extensible Stylesheet Language (XSL), to provide the same kind of facility for XHTML that Cascading Stylesheets (CSS) does for HTML; and XSL Transformations (XSLT), which is a language for transforming XML documents into other XML documents. The list goes on and on, and the complexity of the languages that one can use to process XML documents grows with it. Of passing interest to us is XML Path Language (XPath), used by XSLT to access parts of an XML document. We use a few XPath expressions throughout this chapter, but you won t need to learn anything about XPath to use them.
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s Note XML Query Language (XQuery) is an extension of XPath designed to simplify retrieving information
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from XML documents. It s also used occasionally in SQL Server XML technologies, but we won t use it here.
Fortunately, XML itself and XML documents are the things you ll work with most of the time. They aren t hard to understand.
Understanding XML Documents
An XML document could be a physical file on a computer, a data stream over a network (in theory formatted so a human could read it, but in practice often in compressed binary form), or just a string in memory. However, it has to be complete in itself, and even without a schema it must obey certain rules. The most fundamental rule is that XML documents must be well-formed. At its simplest, this means that overlapping elements aren t allowed, so you must close all child elements before the end tag of their parent element. For example, the following XML document is well formed:
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