How do you setup your own personal namespace?

I have two xsl style sheets, one that generates text and another that 
generates html, that use some identical functions.

I would like to create a namespace to contain the functions used in both 
style sheets and just include the functions in each xsl style sheet. 
 This would make the code much more maintainable since there would only 
be one version instead of two.

Any help would be greatly appreciated.

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