Re: [xsl] Defensive programming in XSLT using asserts and as="..."

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

> What other ways do you do defensive programming in XSLT?

Didn't I already mention "catch-all" templates?

Thanks,
Dimitre

On Fri, May 6, 2022 at 7:16 AM Roger L Costello costello@xxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Hi Folks,
>
> I just love the xsl:assert statement!
>
> I am going wild with it.
>
> I am peppering asserts through my XSLT program. Already I have caught a
> bunch of errors that would otherwise have been missed.
>
> It dawned on me that there are other mechanisms in XSLT that perform
> "implicit asserts":
>
> <xsl:param name="item" as="element(author)"/>
>
> is equivalent to:
>
> <xsl:param name="item"/>
> <xsl:assert test="name($item) eq 'author'"/>
>
> And this:
>
> <xsl:variable name="item" select="..." as="element(author)+" />
>
> is equivalent to:
>
> <xsl:variable name="item" select="..." />
> <xsl:assert test="count($item) ge 1" />
>
> What other mechanisms are there in XSLT that effectively perform implicit
> asserts?
>
> What other ways do you do defensive programming in XSLT?
>
> /Roger
> 
>
>

-- 
Cheers,
Dimitre Novatchev
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