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Glossary
Namespace A unique identifier, such as a Web address, referenced at the start of an
XML document as a source for definitions of the tags and other data
structures used in the document. An XML document can reference more
than one namespace.
Parser Software that reads an XML document and determines the structure and
properties of the data in the document.
Registry An electronic listing of specifications—such as DTDs, XML schemas, and
the metadata about them—as well as pointers to their locations (called
repositories).
Repository A location or set of distributed locations where registry items reside and
from which they can be retrieved and used in conjunction with marked up
documents, such as XML documents.
Schema A set of custom tags and attributes that defines the permissible tagging
structure for an XML document and conforms to the W3C Schema
specification.
Search Engine A program that searches documents for specified keywords and returns a
list of the documents where the keywords are found.
Style Sheet A text file that provides instructions for formatting and displaying the
information in XML documents. Style sheets can include variations
depending on the type of device used to access the document. For
example, the same XML document could be displayed differently on a
handheld wireless computer or a desktop computer, based on different
style sheets.
Valid XML Document An XML document that has an associated document type declaration and
that complies with the specifications expressed in it.
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