===========================
TET 5.0 (November 04, 2015)
===========================

General
-------
- API function TET_get_xml_data() is deprecated, use TET_get_tetml() which
  has the same interface and semantics.

- The "skipengines" option of TET_open_page() is deprecated;
  use the "engines" option of TET_open_document().


CJK Text Extraction
---------------
- The default word splitting behavior for ideographic CJK characters has been
  changed from "split" to "keep". Therefore the suboption "ideographic" of
  the "contentanalysis" page option is no longer required, and has been
  declared as deprecated.
  

Image Extraction
----------------
- TET_write_image_file(): JPEG 2000 images are no longer reported with 
  return value 30 and suffix .jpx, but the function distinguishes between plain
  JPEG 2000 (return type 31, suffix .jp2), extended JPEG 2000 (return type
  32, suffix .jpf), and raw JPEG 2000 code streams (return type 33, suffix
  .j2k). Client code which checks for the image type must be adjusted
  accordingly.

- The unsupported option "format" of TET_write_image_file() and
  TET_get_image_data() is no longer available since the TET kernel needs full
  control over the choice of image output format.

- "smallimages" suboption of the "imageanalysis" page option: the suboption
  "maxcount" is deprecated.


TETML Schema
------------
- New namespace URI: TETML output created by TET 5 adheres to the new TETML
  schema TET-5.0.xsd. All XSLT applications for processing TETML 5 must apply
  the following change to switch to the new TETML schema:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:tet="http://www.pdflib.com/XML/TET3/TET-3.0">
==>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:tet="http://www.pdflib.com/XML/TET5/TET-5.0">


- Additional <Box> elements: The following elements now have an additional
  <Box> element as child (like <Word> in TET 4):
  Para, Table

  This requires changes in XSLT stylesheets which select direct parents of one
  of the affected elements, e.g. Words within Para.

  Example for TET 4 XSLT fragment:

  <xsl:template match="tet:Para">
      <xsl:for-each select="tet:Word">
          <!-- do something with tet:Word element -->
      </xsl:for-each>
  </xsl:template>

  XSLT code updated for TET 5:

  <xsl:template match="tet:Para">
      <xsl:for-each select="tet:Box/tet:Word">
          <!-- do something with tet:Word element -->
      </xsl:for-each>
  </xsl:template>



==========================
TET 4.4 (January 27, 2015)
==========================

- Removed the deprecated suboption "version" of the document option "tetml". 


======================
TET 4.3 (May 26, 2014)
======================

(No compatibility notes)


======================
TET 4.2 (May 10, 2013)
======================

- Maintenance releases require a suitable license key which is available only
  for customers with active support.


===========================
TET 4.1 (February 20, 2012)
===========================

- Perl binding: if an API function returns UTF-8 (which is the default for
  TET_get_text()) the returned Perl string will now be flagged as UTF-8.
  As a result, Perl functions (e.g. length()) count the Unicode characters
  in the string instead of the number of bytes.
  If you get a warning such as the following when writing to file
  
  "Wide character in print at extractor.pl line 76."
  
  you must tell Perl that the output file contains UTF-8 as follows:
  
  binmode(OUTFP, ":utf8");
  
  (see http://perldoc.perl.org/functions/binmode.html for details).

- PHP binding: the name of the TET extension for PHP changed from
  libtet_php.(so|dll|sl) to php_tet.(so|dll|sl).

- The following functions are deprecated:
  TET_utf8_to_utf16(), TET_utf16_to_utf8(),
  TET_utf32_to_utf16(), TET_utf8_to_utf32(),
  TET_utf32_to_utf8(), TET_utf16_to_utf32()
  Use TET_convert_to_unicode() instead.


=======================
TET 4.0 (July 27, 2010)
=======================

- TET_open_page() and TET_process_page(): the following suboptions for the
  contentanalysis option are deprecated:
  lineseparator, wordseparator, zoneseparator
  
  Use the corresponding option in TET_open_document() instead.

- TET_open_document(): the option "keeppua" is deprecated, use the
  following instead:

  fold={{[:Private_Use:] preserve}} or
  fold={{[:Private_Use:] unknownchar}}
  
- TET_get_char_info():
  There is no longer any fixed relationship between glyphs (as represented
  by the TET_char_info structure and characters in the Unicode text
  returned by TET_get_text(). Instead, the set of glyphs for a text chunk
  as a whole is known to generate the sequence of Unicode characters
  comprising the chunk.

- type member in the TET_char_info structure: type=11 (trailing value of
  a surrogate pair) is no longer used since there is no longer any 1:1
  relationship between Unicode values and TET_char_info structures.

- TET_open_document_*():
  the "version" suboption of the "tetml" option is deprecated.


===========================
TET 3.0 (February 02, 2009)
===========================

- The "zoneseparator" suboption of the "contentanalysis" option of
  TET_open_page() is no longer supported.

- TET_open_document_mem() is deprecated; use PVF and TET_open_document().

- TET 2 XML output has been replaced by a more powerful grammar which is
  described by a suitable schema. The old XML grammar can be enabled with
  the option "tetml={version=2}" in TET_open_document().


==========================
TET 2.2 (January 24, 2007)
==========================

- Switched to the new license scheme and keys which has been
  introduced with PDFlib 7.0.0.
  
  
=============================
TET 2.1.0 (December 12, 2005)
=============================

- Option "outputformat" in TET_set_option(): changed the default value on
  zSeries from "utf8" to "ebcdicutf8" (the default on all other systems
  remains "utf8").
  In order to restore the previous behavior issue the following call:
  TET_set_option(p, "outputformat", "utf8");