[xsl] Best Practice: use @as wherever possible

["Roger L Costello costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Michael Kay wrote:
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If you can express the condition with an @as attribute,
use that in preference to an xsl:assert, because it's much
more amenable to static analysis - certainly with Saxon,
xsl:assert will only ever give you a run-time error. The
diagnostics for type errors will also tend to be better.
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Fantastic!

Thank you Michael.

/Roger