[xsl] What is $p in the definition of fn:subsequence ?

The definition of the fn:subsequence in the F & O   W3C  Recommendation at:

    http://www.w3.org/TR/xpath-functions/#func-subsequence

contains the following text:

"Summary: Returns the contiguous sequence of items in the value of
$sourceSeq beginning at the position indicated by the value of
$startingLoc and continuing for the number of items indicated by the
value of $length.

In the two-argument case, returns:

$sourceSeq[fn:round($startingLoc) le $p]
In the three-argument case, returns:

$sourceSeq[fn:round($startingLoc) le $p
     and $p lt fn:round($startingLoc) + fn:round($length)]"


There is no definition of $p and this definitely seems to be a bug in
the document.

Could somebody, please, confirm what is meant by "$p" in this text?

-- 
Cheers,
Dimitre Novatchev
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Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
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Never fight an inanimate object
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You've achieved success in your field when you don't know whether what
you're doing is work or play

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