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The following information was provided by the package's contributor.
Name of contribution: xpackages
Author's name: Morten Høgholm
Location on CTAN: macros/latex/contrib/xpackages
Summary description: xpackages update
License type: lppl
Announcement text given by the package's contributor:
This is a snapshot of the svn repository as of 2008/08/03.
Only stable modules are included, which currently is limited to the
modules xbase and xtheorem.
Changes in xparse:
Semantics for DeclareDocumentCommand has reverted to the original
(overwrite). Two new commands NewDocumentCommand and
RenewDocumentCommand have been introduced. Same applies for
environments.
Xparse:
A reimplementation of the interface to AMS-LaTeX's theorem definition
commands, using the facilities of the template package of xbase.
the interested user may browse the (extensive) readme file for further
details.
Users may view the package catalogue entry at
http://www.tex.ac.uk/tex-archive/help/Catalogue/entries/xpackages.html
or they may browse the package directory at
http://www.tex.ac.uk/tex-archive/macros/latex/contrib/xpackages
thanks for the upload -- everything is now installed and catalogued.