As announced at the TeX Users Group meeting (Summer 1997), a group of
highly experimental packages will has (somewhat belated) been released
to allow experienced TeX programmers to experiment with, and comment
on, a proposed set of syntax conventions and basic data-types that
might form the basis for programming large scale projects in TeX. They
are located in this CTAN directory:

  CTAN:macros/latex/packages/expl3

The documentation of this material is as follows: individual package
files provide outline, draft documentation; there is an article that
gives an overview of the syntax and related concepts; there is a
readme.txt file containing a brief description of the collection.

All aspects of these packages are liable, indeed likely, to change.
They should not be used at this stage for anything that requires a
stable system. However, we do encourage people to experiment with
these packages, and to send comments on them to the LaTeX-L mailing
list.

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We are sorry that it has taken so long to prepare this for
distribution.

The LaTeX Team