Beginning XML with DOM and Ajax: From Novice to Professional by Sas Jacobs

By Sas Jacobs

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There are so many tools available, both as freeware and for purchase, that it’s impossible to summarize them all here. Your choice of tool is likely to be a matter of personal preference. com/vstudio/) fall into the first category. They have good XML support aimed specifically at developers. At the time of writing, the latest version is Visual Studio 2005 and includes the following features: • It helps you create and edit XML documents, including checking whether a document is well formed. • It offers XML schema support, including the ability to infer a schema from an instance document, validation of documents, and conversion from a DTD.

This means that any other definition can access the declaration using the ref keyword. The changed lines appear in bold in the code listing. You can see both the XML document and alternative schema within Figure 2-2. Figure 2-2. The XML document and alternative related schema Creating schema documents with this structure is useful if the same element appears in more than one place. The XML schema has no concept of the document element of an instance document, so you can include more than one global element.

The second prefix, xhtml, refers to XHTML elements within the document. This is an example of a namespace convention. Namespaces use Uniform Resource Identifiers (URIs) to identify each vocabulary. In the case of the previous XHTML content, the W3C controls the URI because it controls the XHTML standard. However, you can associate the cat prefix with any URI under your control. It’s important to note that the URI doesn’t have to point to an actual document or directory. The only requirement is that it’s unique in the XML document.

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