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Working with XML Data
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Is there a standard for the XML language itself While ISO does not currently publish a standard for XML, ISO 8879 provides a standard for SGML (Standard Generalized Markup Language), and XML is based on SGML. More importantly, the World Wide Web Consortium (W3C) publishes XML specifications that comprise the generally accepted standard throughout the IT industry. You mentioned that XML is a convenient way for different parties to exchange information. Does that mean that two companies can freely exchange data without having to create elaborate interface software so long as they both use XML Well, not exactly. XML only provides a standard way to format the data. In order for one company to correctly interpret the XML data that another company has sent them, they must know the names and definitions of the tags the other company formatted for them, particularly the elements and attributes that contain the data. Fortunately, there are a number of industry standards that help. For example, HR/XML provides a standard for exchanging human resources (HR) data, so that a company can, for example, send employee data to a vendor that provides medical insurance to those employees. In some industries, XML is beginning to replace an older standard known as EDI (Electronic Data Interchange).
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As already mentioned, XML is commonly used to represent data on web pages, and that data often comes from relational databases. However, as you have seen, the two models are quite different in that relational data is stored in tables where neither hierarchy nor sequence have any significance, while XML is based on hierarchical trees in which order is considered significant. The term forest is often used to refer to a collection of XML tree structures. XML is used for web pages because its structure so closely matches the structure that would be used to display the same data in HTML. In fact, many web pages are a mixture of HTML for the static portions, and XML for the dynamic data. It is perhaps this widespread implementation that has led many of the major vendors, including Oracle and IBM, to support XML extensions. SQL/XML can be divided into three main parts: the XML data type, SQL/XML functions, and SQL/XML mapping rules. I cover each of these as the major topics in the remainder of this chapter.
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The XML Data Type
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The XML data type is handled in the same general way as all the other data types I had discussed in 3. While storing data in XML format directly in the database is not the only way to use SQL and XML together, it is a very simple way to get started because it is a logical extension
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of the earliest implementations where SQL developers simply stored the XML text in a column defined with a general character data type such as CHARACTER VARYING (VARCHAR). However, it is far better to tell the DBMS that the column contains XML, and the particular way the XML is coded, so that the DBMS can provide additional features tailored to the XML format. The specification for the XML data type has this general format: XML ( <type modifier> {( <secondary type modifier> )} ) The type modifier is required and must be enclosed in a pair of parentheses as shown, while the secondary type modifier is optional, and in fact is not supported for all type modifiers. The standard is not specific about how a particular SQL implementation should treat the various types, but some conventions and syntax rules are specified. The valid type modifiers are:
DOCUMENT The DOCUMENT type is intended for storage of text documents formatted using XML. In general, the data values are expected to be composed of humanreadable characters such as letters, numbers, and symbols as they would appear in an unstructured text document. CONTENT The CONTENT type is intended for more complex data that can include binary data such as images and sound clips. SEQUENCE The SEQUENCE type is intended for XQuery documents, which are often called XQuery sequences. XQuery is an advanced topic that is beyond the scope of this book.
The secondary type modifier, used only with the DOCUMENT and CONTENT primary type modifiers, can have one of these values:
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