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To be notified of validation errors in an XML document, the parser factory must be configured to create a validating parser, as shown in the preceding section.
A considerable amount of XML terminology is introduced, including discussions of parsing, well-formedness, and validation.
XML document structure, legal XML Names, and CDATA are also among the topics.
(To learn more about XML Schema, you can review the online tutorial, Note: There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard.
(Even a DTD qualifies as a "schema," although it is the only one that does not use XML syntax to describe schema constraints.) However, "XML Schema" presents us with a terminology challenge.
Sun's implementation supports any combination of configuration options.
(If a combination is not supported by a particular implementation, it is required to generate a factory configuration error.) Although a full treatment of XML Schema is beyond the scope of this tutorial, this section shows you the steps you take to validate an XML document using an existing schema written in the XML Schema language.
The W3C XML specification states that a program should stop processing an XML document if it finds an error.
The reason is that XML software should be small, fast, and compatible.
To understand XML syntax, we must first be familiar with several basic terms from HTML (and SGML) terminology.
XML syntax, however, differs in some important ways from both HTML and SGML, as we'll see. They represent pieces of information and may or may not contain nested elements that represent even more specific information, attributes, and/or textual content.
One indication of XML's success is that a dozen or so implementations of an XML processor exist.