Identity Component

Name: [p:]identity

Description:

The identity construct makes a verbatim copy of its input available on its
output.

Inputs:

   source:  A sequence of documents.
      The input to copy to the output.

Outputs:

   result:  A sequence of documents.
      A copy of the input to the 'source' input port.

-- 
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity of the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics