[xsl] XSLT 3.0: Question about: Disabling dynamic evaluation unconditionally

Subject: [xsl] XSLT 3.0: Question about: Disabling dynamic evaluation unconditionally
From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 15 Feb 2015 17:52:01 -0000
Hi,
At the end of Section "10.4.4 xsl:evaluate as an optional feature" of
the 2nd Last Call of the W3C XSLT 3.0 specification
(http://www.w3.org/TR/2014/WD-xslt-30-20141002/#evaluation-as-optional-feature)
, the last paragraph says:

"Processors that implement xsl:evaluate should provide mechanisms
allowing calls on xsl:evaluate to be disabled. Implementations may
disable the feature by default, and they may disable it
unconditionally."

My question is:
  What is meant here by "they may disable it unconditionally" ?

Is this something the XSLT processor decides by itself if a certain
kind of event occurs, and does disabling the feature "unconditionally"
mean that after the disablement, the feature can never be enabled
again?

-- 
Cheers,
Dimitre Novatchev

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