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One of the reasons why languages such as Java or Perl have been so successful is the vast amount of libraries that are available to developers.
As XQuery comes with only 150 pre-defined functions, which cannot meet all requirements, there is some need for additional library modules – such as [http://www.xqueryfunctionsfunctx.com/ FunctX] – that extend the language with new features.
BaseX offers the following mechanisms to make modules accessible to the XQuery processor:
==XQuery==
Apart from the package descriptor, a {{Code|.xar}} archive contains a directory which includes the actual XQuery modules. For example, the [http://wwwfiles.basex.org/modules/expath/functx-1.com/ 0.xar FunctX XQuery LibraryXAR archive] is packaged as follows:
<pre>
