XML Calabash supports a repertoire of extension steps (EXProc and implementation-specific). You can declare all of them in one fell swoop by importing the following library:

<p:import href="http://xmlcalabash.com/extension/steps/library-1.0.xpl"/>

Importing this library does not require network access. An internal version of the library is automatically imported when this URI is referenced in a p:import statement.