On Fri, 2022-05-06 at 16:27 +0000, Michael Kay mike(_at_)saxonica(_dot_)com
wrote:
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
This is a good reason; another is that programming errors in assert
expressions are much less likely to be caught than mistakes in as=
For example,
<xsl:param name="item" as="element(author)"/>
is equivalent to:
<xsl:param name="item"/>
<xsl:assert test="name($item) eq 'author'"/>
except of course, as Mike Kay pointed out, it isn't - not only for the
reasons he gave, but also because when you use as="element(author)",
every single use of that parameter will be tested automatically, so
<xsl:sequence select="$item + 6" />
can raise a static error.
--
Liam Quin, https://www.delightfulcomputing.com/
Available for XML/Document/Information Architecture/XSLT/
XSL/XQuery/Web/Text Processing/A11Y training, work & consulting.
Barefoot Web-slave, antique illustrations: http://www.fromoldbooks.org
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