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- From: "Eve L. Maler" <elm@arbortext.com>
- To: xml-dev@ic.ac.uk
- Date: Fri, 02 Jan 1998 12:03:02 -0500
At 11:21 AM 1/2/98 -0500, Patrice Bonhomme wrote:
>
>Hi,
>
>What is the difference between :
> NEXT and FSIBLING
> PREVIOUS and PSIBLING
Hi-- We're working on improving the explanations of these keywords; expect
to see new drafts of XLL soon. In the meantime...
FOLLOWING/PRECEDING (not NEXT/PREVIOUS) refers to the elements (or
pseudo-elements) that start before/after the current one (the "location
source"), anywhere in a document. One way to understand this is to imagine
all the start-tags strung out on a line. Go left to get the PRECEDING
elements of the location source, and go right to get the FOLLOWING elements.
FSIBLING/PSIBLING refers to the elements (or pseudo-elements) before/after
the location source that share the *same parent* as the location source.
So PSIBLING identifies a subset of all PRECEDING elements, and FSIBLING
identifies a subset of all FOLLOWING elements.
I gave an XML/XLL tutorial at the SGML/XML '97 conference, and have put my
PowerPoint slides up on our web site. (They're in .ppt 97 form.) You can
find them at <http://www.arbortext.com/xmlresrc.html> if you'd like to see
the explanation I gave for how the Xpointer addressing keywords work.
Eve
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