This is the mail archive of the
xsl-list@mulberrytech.com
mailing list .
RE: Why is RelationalExpr left associative?
- To: <xsl-list at lists dot mulberrytech dot com>
- Subject: RE: [xsl] Why is RelationalExpr left associative?
- From: "Gavin Thomas Nicol" <gtn at ebt dot com>
- Date: Sun, 29 Apr 2001 18:43:02 -0400
- Reply-To: xsl-list at lists dot mulberrytech dot com
> So the question is: why are these kinds of expressions allowed? Are
> there any useful situations in which one can benefit?
I agree that the grammar is quirky. I think the intent here is to
allow typical recursive definitions of expressions, which typically
allow something like
3 > 2 > 1
to appear.
There are a number of things in XPath that are semantically
invalid, but grammatically correct. Almost all of these are
caused by some form of recursion, or inclusion of a construct
to allow it's use in different contexts through recursion.
"foo"
5
"foo"[5]
"foo"[5]
"foo"["bar"[4]]
5[4[3[2[1]]]]
are legal according to the grammar.
I've often thought of recasting the grammar... but it's
probably too late now.
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list