Excluding namespaces in XSLT

When we write a complex xslt script, we need to introduce functions, templates etc.. XSLT function needs namespace definition. But we may not need those namespaces in the output.
There is an extra attribute we need to define in our xslt script to avoid those additional namespaces,which are not to be present in our output.

eg:

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xmlns:func="http://www.function.com" exclude-result-prefixes="func">

Here if you note that, i have added an attribute(ie: exclude-result-prefixes) to the style-sheet to avoid my additional namespace ,which is  http://www.function.com .