Thank You all for your invaluable Comments, Especially Michael.
On Fri, Oct 1, 2010 at 8:37 PM, Michael Kay <mike(_at_)saxonica(_dot_)com>
wrote:
On 01/10/2010 1:50 PM, chirag matkar wrote:
Hello Friends,
I am an Amateur Developer in Xsl transformations.
I work on Research Article XML conversions.
I just want to be clear on some Concepts of XSLT.
Welcome.
1)When we apply a Template<xsl:apply-templates/> the whole text within
the tags in input file data gets applied and new element are
processed as we declare them.
xsl:apply-templates, in the absence of a select attribute, selects the
immediate children of the context node, and for each one, it finds the best
matching template rule, and applies that rule. If there's no explicit rule
for a node in the stylesheet, it will apply the built-in rule (this often
happens for text nodes, where the built-in rule copies the text unchanged to
the output).
Note I'm using the terminology of trees and nodes, rather than tags and
input files. If you want to understand XSLT concepts, you need to learn to
think of the input XML as a tree (the tree that comes out of the XML
parser), not the lexical angle-bracket stuff that went into the parser.
An individual call on xsl:apply-templates only causes the children to be
processed, not all the descendants. However, the default action for the
children is to recurse downwards to their own children, so the default
processing does a complete tree walk.
So when we use<xsl:value of select=""/> ,additional data is
processed.This results into extra junk data as i have noticed.How to
avoid such circumstances.?
You should (usually!) process text nodes using ether xsl:apply-templates or
xsl:value-of, but not both.
2)Also Suppose we tag the input data with new elements,the tags appear
in the sequence of initial text in the data.How can we sequentially
keep changing order of the data as we wish and apply templates
accordingly.
Example - we need to tag article title which appears at end in the
input file but we wish to have it tagged first in the output file.ie
change order of tags according to our requirements.
This is where the select attribute of xsl:apply-templates comes in. Normally
the children are processed in (input) document order. If you want a
different order, or if you want to process the children selectively, you can
do:
<xsl:apply-templates select="author, abstract, citations, body"/>
(That's XSLT 2.0 syntax: in 1.0 you need four sucessive calls on
xsl:apply-templates, each to process one kind of child element).
3)Can we template match a tag more than one time and process nodes
within it sequentially?
Yes. If you want different processing on different occasions, use modes. The
usual example is a table of contents:
<xsl:apply-templates select="*" mode="table-of-contents"/>
<xsl:apply-templates select="*" mode="article-body"/>
The xsl:template rule itself has a mode attribute, and the template will
only be activated if its mode matches the requested mode.
Michael Kay
Saxonica
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Regards,
Chirag Matkar
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