At 2011-10-23 18:21 -0700, Mark wrote:
One more small question: I am confused by brackets in XPath;
The brackets specify a predicate used to keep or toss the nodes
tested in the step from the next step of the location path.
what is the difference between
Location[name(@*)]
That is atypical. It is addressing the child element <Location> and
only keeping it if there is an attribute, because the name() function
returns a non-empty string. An empty string tests as false(), a
non-empty string tests as true(). One wouldn't write the above
because that particular predicate test is nonsensical in this
situation (but not syntactically in error).
Location/@*
That addresses the attributes of the child element <Location>.
Location[@*]
That addresses the child element <Location> but only keeps it if the
element has any attributes. If the element doesn't have attributes,
the XPath expression stops getting evaluated.
Chapter 3 section 2 of my XSLT book (free preview download on my web
site) describes the syntax of XPath expressions in gory detail.
I hope this helps.
. . . . . . . . Ken
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