November 2004
Intermediate to advanced
1024 pages
27h 50m
English
Content preview from Core Java™ 2 Volume II - Advanced Features, Seventh Edition
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Using Namespaces
Java uses packages to avoid name clashes. Programmers can use the same name for different classes as long as they aren't in the same package. XML has a similar namespace mechanism for element and attribute names.
A namespace is identified by a Uniform Resource Identifier (URI), such as
http://www.w3.org/2001/XMLSchema uuid:1c759aed-b748-475c-ab68-10679700c4f2 urn:com:books-r-us
The HTTP URL form is the most common. Note that the URL is just used as an identifier string, not as a locator for a document. For example, the namespace identifiers
http://www.horstmann.com/corejava http://www.horstmann.com/corejava/index.html
denote different namespaces, even though a web server would serve the same document for both URLs.
There ...
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