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Gaining an XML Vocabulary

SQL has formal grammar rules that depend on the structure of relational databases. XML has a hierarchical structure based on SGML; XML-related “programming” languages, which manipulate XML documents, have a very complex grammar. Before you can begin to interpret—not to mention write and manipulate—XML documents, you need to know a few basic XML terms.

Note

The quotes around “programming” in the preceding paragraph are used to contrast conventional, sequentially executed programs that you write in VBA or other familiar programming languages with XML code that manipulates XML documents. XML document-manipulation code, written in Extensible Stylesheet Language (XSL) and XSL Transformation (XSLT), often deals with the entire document as a single “chunk.” Examples later in this chapter illustrate the use of VBScript code to process XML data documents sequentially.



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