Comments on core cd-1 substring functions

Hello all,

I have some more comments on the new cd-1 functions string-substring and
uri-substring:

1.  The standard should define what happens if  the second or third
parameter of this function is out of bounds of the string/uri.

2. The standard should define for the uri-substring function what
happens if the resulting substring is not a valid uri
(e.g. substring(urn:oasis:names:tc:xacml, 4,10) == 'oasis:' )

Regards,

Ludwig

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