PDFlib Text Extraction Toolkit (TET) Manual

8.5 XSLT Samples
The TET distribution includes several XSLT stylesheets which demonstrate the power of
XSLT applied to TETML, and can be used as a starting point for TETML applications. This
section provides an overview of the XSLT samples and presents sample output. Section
8.4, »Transforming TETML with XSLT«, page 97 discusses many options for deploying
the XSLT stylesheets. More details regarding the functionality and inner workings of the
stylesheets can be found in comments in the XSLT code. Some general aspects of the
stylesheet samples:
> Most XSLT samples support parameters which can used to control various processing
details. These parameters can be set within the XSLT code or overridden from the
environment (e.g. ant).
> Most XSLT samples require TETML input in a certain text mode (e.g. word mode, see
»TETML text modes«, page 92, for details). In order to protect themselves from wrong
input, they check whether the supplied TETML input conforms to the requirement,
and report an error otherwise.
> Some XSLT samples recursively process PDF attachments in the document (this is
mentioned in the descriptions below). Most samples ignore PDF attachments,
though. They are written in a way so that they can easily be expanded to process attachments
as well. It is sufficient to select the interesting elements within the
Attachments element; the relevant xsl:template elements themselves don’t have to be
modified.
> All XSLT samples work with XSLT 1. While some samples could be simplified using
features from XSLT 2, we wanted to stick to XSLT 1 for better usability.
Create a concordance. The concordance.xsl stylesheet expects TETML input in word or
wordplus mode. It creates a concordance, i.e. a list of unique words in a document sorted
by descending frequency. This may be useful to create a concordance for linguistic analysis,
cross-references for translators, consistency checks, etc.
List of words in the document along with the number of occurrences:
the 207
font 107
of 100
a 92
in 83
and 75
fonts 64
PDF 60
FontReporter 58
...
Font filtering. The fontfilter.xsl stylesheet expects TETML input in glyph or wordplus
mode. It lists all words in a document which use a particular font in a size larger than a
specified value. This may be useful to detect certain font/size combinations or for quality
control. The same concept can be used to create a table of contents based on text portions
which use a large font size.
Text containing font 'TheSansBold-Plain' with size greater than 10:
[TheSansBold-Plain/24] Contents
8.5 XSLT Samples 101