> Error at char 28 in expression in xsl:value-of/@select on line 10 column 69
of trf1.xsl:
>   FORG0001  Invalid duration value 'PT2.5H' (H is out of sequence)
>   In template rule with match="/" on line 8 of trf1.xsl
> Invalid duration value 'PT2.5H' (H is out of sequence)
>
> What I'm not doing correctly?
>

Surely the error message is pretty clear?

See https://www.w3.org/TR/xmlschema-2/#duration

B'3.2.6.1  The values of the Year, Month, Day, Hour and Minutes components are
not restricted but allow an arbitrary unsigned integer, i.e., an integer that
conforms to the pattern [0-9]+

Michael Kay
Saxonica