Add documentation.

20 files changed, 1763 insertions, 28 deletions

diff --git a/Makefile.am b/Makefile.am
index 5419ad7..19cb54b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,7 +16,7 @@
 
 ACLOCAL_AMFLAGS = -I m4 -I am
 
-SUBDIRS = src scripts examples
+SUBDIRS = src scripts examples doc
 
 # Define the following variables in order to use the ChangeLog rule below:
 #  prev_change_log  [optional]  Name of the previous ChangeLog file.
diff --git a/NEWS b/NEWS
index d0cb342..3cd6491 100644
--- a/NEWS
+++ b/NEWS
@@ -1,10 +1,12 @@
-Gamma NEWS -- history of user-visible changes. 2010-03-13
+Gamma NEWS -- history of user-visible changes. 2010-03-15
 Copyright (C) 2004, 2007, 2010 Sergey Poznyakoff
 See the end of file for copying conditions.
 
 Please send radius bug reports to <gray@gnu.org.ua>
 
 
+Version 1.99.99
+
 * New modules: expat and syslog
 
 
diff --git a/README b/README
index 4f2b6f1..14ed675 100644
--- a/README
+++ b/README
@@ -1,36 +1,71 @@
-GAMMA = Guile Archive of Multiple Modules with 'A' just for the 'A' of it.
+Gamma README
+Copyright (C) 2002, 2004, 2007, 2010 Sergey Poznyakoff
+See end of file for copying conditions
 
 * Introduction
 
-It is a set of possibly useful modules. Currently it includes
+This file contains brief information about configuring, testing
+and running Gamma. It is provided as a brief reference only.
+More specifically, is *not* intended as a replacement for the
+documentation. The complete documentation for Gamma is available
+in the doc/ subdirectory. To read it without installing the package
+run `info -f doc/gamma.info'. After the package is installed
+the documentation can be accessed running `info gamma'. 
 
-** interfaces for two SQL DBMS: MySQL and PostgreSQL
-** interfaces to Expat
-** interfaces to syslog
+An online copy of the documentation in various formats is available
+at http://gamma.man.gnu.org.ua.
 
-Both are extensively used by Ellinika (http://ellinika.farlep.net)
-and Runasimi (http://www.runasimi.org).
+* Overview
 
-* Installation
+Gamma is a set of assorted modules for Guile. It includes:
 
-Please see the INSTALL file in this directory for the generic instructions
-on how to use configure. The list of GAMMA-specific options follows:
+** (gamma sql)
 
-** --without-mysql
+This module provides interfaces for two SQL DBMS: MySQL and PostgreSQL.
 
-Configure to work without MySQL
+** (gamma expat)
 
-** --without-postgres
+Interfaces to Expat: a library for parsing XML documents.
 
-Configure to work without Postgres
+** (gamma syslog)
+
+Interfaces to syslog(2).
+
+* Uses
+
+Gamma is the main working horse for xmltools[1], a parser engine
+powering Ellinika[2] and Runasimi[3] web projects.
+
+For more info on these, see:
+
+[1] http://puszcza.gnu.org.ua/projects/xmltools/
+[2] http://ellinika.gnu.org.ua
+[3] http://www.runasimi.org
+
+* Installation
+
+For generic instructions on how to use configure, see the INSTALL file
+in this directory. The following is a list of Gamma-specific options:
+
+** --disable-expat
+
+Disables building of the expat module
 
 ** --disable-sql
 
-Disable both SQL interfaces.
+Disables building of the sql module
 
 ** --disable-syslog
 
-Do not compile syslog bindings.
+Disables building of the syslog module
+
+** --without-mysql
+
+Configure to work without MySQL
+
+** --without-postgres
+
+Configure to work without Postgres
 
 ** --with-guiledir=DIR
 
@@ -68,6 +103,25 @@ is equivalent to running
 
   ./configure LDFLAGS="-L/usr/mysql/lib -L/usr/pgsql/lib"
 
+* Bug reporting.		
+
+Send bug reports to <gray+gamma@gnu.org.ua>. 
+
+
+* Copyright information:
+
+Copyright (C) 2002, 2004, 2007, 2010 Sergey Poznyakoff
+
+   Permission is granted to anyone to make or distribute verbatim copies
+   of this document as received, in any medium, provided that the
+   copyright notice and this permission notice are preserved,
+   thus giving the recipient permission to redistribute in turn.
+
+   Permission is granted to distribute modified versions
+   of this document, or of portions of it,
+   under the above conditions, provided also that they
+   carry prominent notices stating who last changed them.
+  
 
 Local Variables:
 mode: outline
@@ -77,4 +131,4 @@ End:
 
 
 
-  
\ No newline at end of file
+  
diff --git a/README-alpha b/README-alpha
new file mode 100644
index 0000000..58303ef
--- /dev/null
+++ b/README-alpha
@@ -0,0 +1,75 @@
+This file is part of Gamma package.
+See end of file for copying conditions.
+
+* Introduction
+
+This is a *pre-release* version, and not ready for production use yet.
+If you are taking source from GIT, you will need to have several
+special tools to help contribute. See the file README-hacking for more
+information, See chapter `Bootstrapping' for the detailed instructions on
+how to build the package.
+
+Please, note that the accompanying documentation may be inaccurate
+or incomplete. The Git logs are the authoritative documentation of
+all recent changes. To convert them to the traditional ChangeLog
+format, run `make ChangeLog'.
+
+Please send comments and problem reports to <gray+gamma@gnu.org.ua>.
+
+* Checking Out the Sources
+
+The following instructions apply if you wish to obtain sources from
+the GIT repository:
+
+To clone the Gamma repository, issue the following command:
+
+  git clone git://git.gnu.org.ua/gamma.git
+
+or
+
+  git clone http://git.gnu.org.ua/repo/gamma.git
+
+This will create a directory named `gamma' and populate it with the
+sources.
+
+If you are not interested in the entire development history, you can
+abridge it by giving the `--depth' option to clone.  For example,
+
+  git clone --depth 2 git://git.gnu.org.ua/repo/gamma.git
+
+will clone only two recent revisions from the repository.
+
+For more information about GIT access, visit
+http://puszcza.gnu.org.ua/git/?group=gamma
+
+* Building
+
+The usual procedures apply:
+
+ ./configure
+ make
+ make install
+
+See INSTALL and README for the detailed instructions.
+
+* Copyright information:
+
+Copyright (C) 2002, 2004, 2007, 2010 Sergey Poznyakoff
+
+   Permission is granted to anyone to make or distribute verbatim copies
+   of this document as received, in any medium, provided that the
+   copyright notice and this permission notice are preserved,
+   thus giving the recipient permission to redistribute in turn.
+
+   Permission is granted to distribute modified versions
+   of this document, or of portions of it,
+   under the above conditions, provided also that they
+   carry prominent notices stating who last changed them.
+
+
+Local Variables:
+mode: outline
+paragraph-separate: "[ 	]*$"
+version-control: never
+End:
+
diff --git a/README-hacking b/README-hacking
index a668241..f9a5c99 100644
--- a/README-hacking
+++ b/README-hacking
@@ -31,7 +31,7 @@ You do this as follows:
    scripts/bootstrap --moddir modules --parents
 
 Once done, proceed as described in the file README (section
-INSTALLATION).
+"Installation").
    
 For more information about `bootstrap', run `bootstrap --help'.
 
diff --git a/am/guile.m4 b/am/guile.m4
index 2aa25c9..43e08c1 100644
--- a/am/guile.m4
+++ b/am/guile.m4
@@ -42,7 +42,7 @@ AC_DEFUN([MU_CHECK_GUILE],
      GUILE_INCLUDES=`guile-config compile`
      GUILE_LIBS=`guile-config link`
    fi
-   gpath=`bindir $GUILE_CONFIG`:$PATH
+   gpath=`dirname $GUILE_CONFIG`:$PATH
    AC_PATH_PROG(GUILE_SNARF, guile-snarf, no, $gpath)
    
    if test $GUILE_CONFIG != no; then
diff --git a/configure.ac b/configure.ac
index 4f3b6e4..483b882 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,12 +16,12 @@ dnl along with Gamma.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ(2.63)
 
-AC_INIT(gamma, 1.99, [gray@gnu.org.ua])
+AC_INIT(gamma, [1.99.99], [gray+gamma@gnu.org.ua])
 AC_CONFIG_SRCDIR(src/guile-sql.h)
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CANONICAL_SYSTEM
-AM_INIT_AUTOMAKE([1.11.1 gnu tar-ustar silent-rules])
+AM_INIT_AUTOMAKE([1.11.1 gnu tar-ustar readme-alpha silent-rules])
 AC_CONFIG_HEADERS([config.h])
 
 # Enable silent rules by default:
@@ -74,6 +74,36 @@ if test -z "$GAMMA_LIB_LIST"; then
   AC_MSG_ERROR([Nothing to build!])
 fi
 
-AC_CONFIG_FILES(Makefile src/Makefile scripts/Makefile examples/Makefile)
+# Doc hints.
+# Select a rendition level:
+#  DISTRIB for stable releases (at most one dot in the version number)
+#  and maintenance releases (two dots, patchlevel < 50)
+#  PROOF for alpha releases.
+#  PUBLISH can only be required manually when running make in doc/
+AC_SUBST(RENDITION)
+case `echo $VERSION|sed  's/[[^.]]//g'` in
+""|".")  RENDITION=DISTRIB;;
+"..")  if test `echo $VERSION | sed  's/.*\.//'` -lt 50; then
+	 RENDITION=DISTRIB
+       else
+         RENDITION=PROOF
+       fi;;
+*)     RENDITION=PROOF;;
+esac
+  
+if test $RENDITION = "PROOF"; then
+  if test -r $srcdir/git-describe; then
+    GIT_DESCRIBE=`sed '2,$d' $srcdir/git-describe`
+    AC_DEFINE_UNQUOTED([GIT_DESCRIBE], "$GIT_DESCRIBE",
+                       [The most recent git tag])
+  fi
+fi
+
+
+AC_CONFIG_FILES(Makefile
+                src/Makefile
+		scripts/Makefile
+		examples/Makefile
+		doc/Makefile)
 
 AC_OUTPUT
diff --git a/doc/.gitignore b/doc/.gitignore
new file mode 100644
index 0000000..f985f1a
--- /dev/null
+++ b/doc/.gitignore
@@ -0,0 +1,21 @@
+gamma.info*
+stamp-vti
+version.texi
+gamma.aux
+gamma.cp
+gamma.cps
+gamma.dvi
+gamma.fl
+gamma.fn
+gamma.kw
+gamma.ky
+gamma.log
+gamma.mt
+gamma.op
+gamma.pg
+gamma.pr
+gamma.ps
+gamma.toc
+gamma.tp
+gamma.vr
+
diff --git a/doc/Makefile.am b/doc/Makefile.am
new file mode 100644
index 0000000..bb3d940
--- /dev/null
+++ b/doc/Makefile.am
@@ -0,0 +1,130 @@
+# This file is part of Gamma.
+# Copyright (C) 2002, 2007, 2010 Sergey Poznyakoff
+#
+# Gamma is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# Gamma is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Gamma.  If not, see <http://www.gnu.org/licenses/>.
+
+info_TEXINFOS=gamma.texi
+gamma_TEXINFOS=\
+ fdl.texi\
+ macros.texi\
+ rendition.texi\
+ expat.texi\
+ syslog.texi\
+ sql.texi
+
+EXTRA_DIST = \
+ gendocs_template\
+ mastermenu.el\
+ untabify.el
+
+clean-local:
+	@rm -rf manual
+
+# Checking
+check-format:
+	@if test -n "`cat $(info_TEXINFOS) $(gamma_TEXINFOS) | tr -d -c '\t'`"; then \
+		echo "Sources contain tabs; run make untabify"; \
+		false; \
+	fi
+
+check-refs:
+	@for file in $(info_TEXINFOS) $(gamma_TEXINFOS); \
+	do \
+	  sed -e = $$file | \
+           sed -n 'N;/@FIXME-.*ref/{s/\(^[0-9][0-9]*\).*@FIXME-.*ref{\([^}]*\)}.*/'$$file':\1: \2/gp}'; \
+	done > $@-t; \
+	if [ -s $@-t ]; then \
+	  echo "Unresolved cross-references:"; \
+	  cat $@-t;\
+	  rm $@-t; \
+	else \
+	  rm -f $@-t; \
+	fi
+
+check-fixmes:
+	@for file in $(info_TEXINFOS) $(gamma_TEXINFOS); \
+	do \
+	  sed -e = $$file | \
+           sed -n 'N;/@FIXME{/{s/\(^[0-9][0-9]*\).*@FIXME{\([^}]*\).*/'$$file':\1: \2/gp}'; \
+	done > $@-t; \
+	if [ -s $@-t ]; then \
+	  echo "Unresolved FIXMEs:"; \
+	  cat $@-t; \
+	  rm $@-t; \
+	  false; \
+	else \
+          rm -f $@-t; \
+	fi
+
+check-writeme:
+	@grep -Hn @WRITEME $(info_TEXINFOS) $(gamma_TEXINFOS) > $@-t; \
+	if [ -s $@-t ]; then \
+	  echo "Empty nodes:"; \
+	  cat $@-t; \
+	  rm $@-t; \
+	  false;\
+	else \
+          rm $@-t; \
+	fi
+
+check-unrevised:
+	@grep -Hn @UNREVISED $(info_TEXINFOS) $(gamma_TEXINFOS) > $@-t; \
+	if [ -s $@-t ]; then \
+	  echo "Unrevised nodes:"; \
+	  cat $@-t; \
+	  rm $@-t; \
+	  false;\
+	else \
+          rm $@-t; \
+	fi
+
+all-check-docs: check-format \
+                check-refs check-fixmes check-writeme check-unrevised
+
+check-docs: 
+	@$(MAKE) -k all-check-docs
+
+#
+
+master-menu:
+	-$(AM_V_GEN)grep -q '^@detailmenu' $(info_TEXINFOS) && \
+	 emacs -batch -l mastermenu.el -f make-master-menu $(info_TEXINFOS)
+
+untabify:
+	@emacs -batch -l untabify.el $(info_TEXINFOS) $(gamma_TEXINFOS)
+
+final: untabify master-menu
+
+# The rendering level is one of PUBLISH, DISTRIB or PROOF.
+# Just call `make RENDITION=PROOF [target]' if you want PROOF rendition.
+
+MAKEINFOFLAGS=-D$(RENDITION)
+
+GENDOCS=gendocs.sh 
+
+TEXI2DVI=texi2dvi -t '@set $(RENDITION)' -E
+
+# Make sure you set TEXINPUTS.
+# TEXINPUTS=/usr/share/texmf/pdftex/plain/misc/ is ok for most distributions
+.PHONY: manual
+manual:
+	TEXINPUTS=$(srcdir):$(top_srcdir)/build-aux:$(TEXINPUTS) \
+	 MAKEINFO="$(MAKEINFO) $(MAKEINFOFLAGS)" \
+	 TEXI2DVI="$(TEXI2DVI) -t @finalout" \
+	 $(GENDOCS) --texi2html $(PACKAGE) '$(PACKAGE_NAME) manual'
+
+manual.tar.bz2: manual
+	tar cfj manual.tar.bz2 manual
+
+man-tar: manual.tar.bz2
diff --git a/doc/expat.texi b/doc/expat.texi
new file mode 100644
index 0000000..e52a636
--- /dev/null
+++ b/doc/expat.texi
@@ -0,0 +1,285 @@
+@c This file is part of the Gamma manual.
+@c Copyright (C) 2010 Sergey Poznyakoff
+@c See gamma.texi for copying conditions.
+@c *******************************************************************
+@WRITEME
+
+The @samp{(gamma expat)} module provides interface with
+@command{libexpat}, a library for parsing @acronym{XML} documents.
+
+Usage:
+
+@lisp
+(use-modules ((gamma expat)))
+@end lisp
+
+@menu
+* primitives::             Expat Primitives
+* handlers::
+@end menu
+
+@node primitives
+@section Expat Primitives
+@WRITEME
+
+@deffn {Scheme procedure} xml-primitive-make-parser enc sep
+Return a new @acronym{XML} parser. If @var{enc} is given, it must be one of:
+@samp{US-ASCII}, @samp{UTF-8}, @samp{UTF-16}, @samp{ISO-8859-1}.  If @var{sep}
+is given, the returned parser has namespace processing in effect.  In
+that case, @var{sep} is a character which is used as a separator
+between the namespace @acronym{URI} and the local part of the name in
+returned namespace element and attribute names.
+@end deffn
+
+@deffn {Scheme procedure} xml-set-encoding parser enc
+Set the encoding to be used by the @var{parser}.  The latter must be a
+value returned from a previous call to
+@code{xml-primitive-make-parser} or @code{xml-make-parser}.
+
+The sequence:
+
+@lisp
+@group
+  (let ((parser (xml-primitive-make-parser)))
+    (xml-set-encoding parser encoding)
+    @dots{}
+@end group    
+@end lisp
+
+@noindent
+is equivalent to:
+
+@lisp
+  (let ((parser (xml-primitive-make-parser encoding)))
+   @dots{}
+@end lisp
+
+@noindent
+and to:
+
+@lisp
+  (let ((parser (xml-make-parser encoding)))
+   @dots{}
+@end lisp
+@end deffn
+
+@deffn {Scheme procedure} xml-primitive-parse parser input isfinal
+Parse next piece of input.  Arguments are:
+
+@table @var
+@item parser
+A parser returned from a previous call to
+@code{xml-primitive-make-parser} or @code{xml-make-parser}.
+
+@item input
+A piece of input text.
+
+@item isfinal
+Boolean value indicating whether @var{input} is the last part of
+input.
+@end table
+@end deffn
+
+@deffn {Scheme procedure} xml-primitive-set-handler parser key handler
+Set @acronym{XML} handler for an event.  Arguments are:
+
+@table @var
+@item parser
+A valid @acronym{XML} parser
+
+@item key
+A key, identifying an event.
+
+@table @asis
+@kwindex start-element-handler
+@item #:start-element-handler
+
+@kwindex end-element-handler
+@item #:end-element-handler
+
+@kwindex character-data-handler
+@item #:character-data-handler
+
+@kwindex processing-instruction-handler
+@item #:processing-instruction-handler
+
+@kwindex comment-handler
+@item #:comment-handler
+
+@kwindex start-cdata-section-handler
+@item #:start-cdata-section-handler
+
+@kwindex end-cdata-section-handler
+@item #:end-cdata-section-handler
+
+@kwindex default-handler
+@item #:default-handler
+
+@kwindex default-handler-expand
+@item #:default-handler-expand
+
+@kwindex external-entity-ref-handler
+@item #:external-entity-ref-handler
+
+@kwindex skipped-entity-handler
+@item #:skipped-entity-handler
+
+@kwindex unknown-encoding-handler
+@item #:unknown-encoding-handler
+
+@kwindex start-namespace-decl-handler
+@item #:start-namespace-decl-handler
+
+@kwindex end-namespace-decl-handler
+@item #:end-namespace-decl-handler
+
+@kwindex xml-decl-handler
+@item #:xml-decl-handler
+
+@kwindex start-doctype-decl-handler
+@item #:start-doctype-decl-handler
+
+@kwindex end-doctype-decl-handler
+@item #:end-doctype-decl-handler
+
+@kwindex element-decl-handler
+@item #:element-decl-handler
+
+@kwindex attlist-decl-handler
+@item #:attlist-decl-handler
+
+@kwindex entity-decl-handler
+@item #:entity-decl-handler
+
+@kwindex unparsed-entity-decl-handler
+@item #:unparsed-entity-decl-handler
+
+@kwindex notation-decl-handler
+@item #:notation-decl-handler
+
+@kwindex not-standalone-handler
+@item #:not-standalone-handler
+@end table
+
+
+@item handler
+Handler procedure.
+@end table
+@end deffn
+
+@deffn {Scheme function} xml-make-parser args@dots{}
+@FIXME
+@end deffn
+
+@deffn {Scheme function} xml-parse-more parser input
+Equivalent to:
+
+@lisp
+(xml-primitive-parse parser input #f)
+@end lisp
+
+@noindent
+unless @var{input} is an end-of-file object, in which case it
+is equivalent to:
+
+@lisp
+(xml-primitive-parse parser "" #t)
+@end lisp
+@end deffn
+
+@deffn {Scheme function} xml-parse parser
+@FIXME
+@end deffn
+
+@deffn {Scheme function} xml-set-handler parser args@dots{}
+@FIXME
+@end deffn
+
+@node handlers
+@section Expat Handlers
+@WRITEME
+
+@deffn {Handler prototype} start-element name attrs
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} end-element name
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} character-data text
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} processing-instruction target data
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} comment text
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} start-cdata-section
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} end-cdata-section
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} default text
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} default-expand text
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} unparsed-entity-decl entity-name base @
+ system-id public-id notation-name
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} notation-decl notation-name base @
+ system-id public-id
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} start-namespace prefix uri
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} end-namespace prefix
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} skipped-entity entity-name parameter?
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} not-standalone 
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} xml-decl version encoding detail
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} start-doctype-decl name sysid pubid @
+ has-internal-subset?
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} end-doctype-decl
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} attlist-decl el-name att-name att-type detail
+@FIXME
+@end deffn
+
+@deffn {Handler prototype} entity-decl name param? value base sys-id pub-id @
+ notation
+@FIXME
+@end deffn
+
diff --git a/doc/fdl.texi b/doc/fdl.texi
new file mode 100644
index 0000000..7da8738
--- /dev/null
+++ b/doc/fdl.texi
@@ -0,0 +1,449 @@
+@setfilename fdl.info
+@cindex FDL, GNU Free Documentation License
+@center Version 1.2, November 2002
+
+@display
+Copyright @copyright{} 2000,2001,2002 Free Software Foundation, Inc.
+59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
+
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+@end display
+
+@enumerate 0
+@item
+PREAMBLE
+
+The purpose of this License is to make a manual, textbook, or other
+functional and useful document @dfn{free} in the sense of freedom: to
+assure everyone the effective freedom to copy and redistribute it,
+with or without modifying it, either commercially or noncommercially.
+Secondarily, this License preserves for the author and publisher a way
+to get credit for their work, while not being considered responsible
+for modifications made by others.
+
+This License is a kind of ``copyleft'', which means that derivative
+works of the document must themselves be free in the same sense.  It
+complements the GNU General Public License, which is a copyleft
+license designed for free software.
+
+We have designed this License in order to use it for manuals for free
+software, because free software needs free documentation: a free
+program should come with manuals providing the same freedoms that the
+software does.  But this License is not limited to software manuals;
+it can be used for any textual work, regardless of subject matter or
+whether it is published as a printed book.  We recommend this License
+principally for works whose purpose is instruction or reference.
+
+@item
+APPLICABILITY AND DEFINITIONS
+
+This License applies to any manual or other work, in any medium, that
+contains a notice placed by the copyright holder saying it can be
+distributed under the terms of this License.  Such a notice grants a
+world-wide, royalty-free license, unlimited in duration, to use that
+work under the conditions stated herein.  The ``Document'', below,
+refers to any such manual or work.  Any member of the public is a
+licensee, and is addressed as ``you''.  You accept the license if you
+copy, modify or distribute the work in a way requiring permission
+under copyright law.
+
+A ``Modified Version'' of the Document means any work containing the
+Document or a portion of it, either copied verbatim, or with
+modifications and/or translated into another language.
+
+A ``Secondary Section'' is a named appendix or a front-matter section
+of the Document that deals exclusively with the relationship of the
+publishers or authors of the Document to the Document's overall
+subject (or to related matters) and contains nothing that could fall
+directly within that overall subject.  (Thus, if the Document is in
+part a textbook of mathematics, a Secondary Section may not explain
+any mathematics.)  The relationship could be a matter of historical
+connection with the subject or with related matters, or of legal,
+commercial, philosophical, ethical or political position regarding
+them.
+
+The ``Invariant Sections'' are certain Secondary Sections whose titles
+are designated, as being those of Invariant Sections, in the notice
+that says that the Document is released under this License.  If a
+section does not fit the above definition of Secondary then it is not
+allowed to be designated as Invariant.  The Document may contain zero
+Invariant Sections.  If the Document does not identify any Invariant
+Sections then there are none.
+
+The ``Cover Texts'' are certain short passages of text that are listed,
+as Front-Cover Texts or Back-Cover Texts, in the notice that says that
+the Document is released under this License.  A Front-Cover Text may
+be at most 5 words, and a Back-Cover Text may be at most 25 words.
+
+A ``Transparent'' copy of the Document means a machine-readable copy,
+represented in a format whose specification is available to the
+general public, that is suitable for revising the document
+straightforwardly with generic text editors or (for images composed of
+pixels) generic paint programs or (for drawings) some widely available
+drawing editor, and that is suitable for input to text formatters or
+for automatic translation to a variety of formats suitable for input
+to text formatters.  A copy made in an otherwise Transparent file
+format whose markup, or absence of markup, has been arranged to thwart
+or discourage subsequent modification by readers is not Transparent.
+An image format is not Transparent if used for any substantial amount
+of text.  A copy that is not ``Transparent'' is called ``Opaque''.
+
+Examples of suitable formats for Transparent copies include plain
+@sc{ascii} without markup, Texinfo input format, La@TeX{} input
+format, @acronym{SGML} or @acronym{XML} using a publicly available
+@acronym{DTD}, and standard-conforming simple @acronym{HTML},
+PostScript or @acronym{PDF} designed for human modification.  Examples
+of transparent image formats include @acronym{PNG}, @acronym{XCF} and
+@acronym{JPG}.  Opaque formats include proprietary formats that can be
+read and edited only by proprietary word processors, @acronym{SGML} or
+@acronym{XML} for which the @acronym{DTD} and/or processing tools are
+not generally available, and the machine-generated @acronym{HTML},
+PostScript or @acronym{PDF} produced by some word processors for
+output purposes only.
+
+The ``Title Page'' means, for a printed book, the title page itself,
+plus such following pages as are needed to hold, legibly, the material
+this License requires to appear in the title page.  For works in
+formats which do not have any title page as such, ``Title Page'' means
+the text near the most prominent appearance of the work's title,
+preceding the beginning of the body of the text.
+
+A section ``Entitled XYZ'' means a named subunit of the Document whose
+title either is precisely XYZ or contains XYZ in parentheses following
+text that translates XYZ in another language.  (Here XYZ stands for a
+specific section name mentioned below, such as ``Acknowledgements'',
+``Dedications'', ``Endorsements'', or ``History''.)  To ``Preserve the Title''
+of such a section when you modify the Document means that it remains a
+section ``Entitled XYZ'' according to this definition.
+
+The Document may include Warranty Disclaimers next to the notice which
+states that this License applies to the Document.  These Warranty
+Disclaimers are considered to be included by reference in this
+License, but only as regards disclaiming warranties: any other
+implication that these Warranty Disclaimers may have is void and has
+no effect on the meaning of this License.
+
+@item
+VERBATIM COPYING
+
+You may copy and distribute the Document in any medium, either
+commercially or noncommercially, provided that this License, the
+copyright notices, and the license notice saying this License applies
+to the Document are reproduced in all copies, and that you add no other
+conditions whatsoever to those of this License.  You may not use
+technical measures to obstruct or control the reading or further
+copying of the copies you make or distribute.  However, you may accept
+compensation in exchange for copies.  If you distribute a large enough
+number of copies you must also follow the conditions in section 3.
+
+You may also lend copies, under the same conditions stated above, and
+you may publicly display copies.
+
+@item
+COPYING IN QUANTITY
+
+If you publish printed copies (or copies in media that commonly have
+printed covers) of the Document, numbering more than 100, and the
+Document's license notice requires Cover Texts, you must enclose the
+copies in covers that carry, clearly and legibly, all these Cover
+Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
+the back cover.  Both covers must also clearly and legibly identify
+you as the publisher of these copies.  The front cover must present
+the full title with all words of the title equally prominent and
+visible.  You may add other material on the covers in addition.
+Copying with changes limited to the covers, as long as they preserve
+the title of the Document and satisfy these conditions, can be treated
+as verbatim copying in other respects.
+
+If the required texts for either cover are too voluminous to fit
+legibly, you should put the first ones listed (as many as fit
+reasonably) on the actual cover, and continue the rest onto adjacent
+pages.
+
+If you publish or distribute Opaque copies of the Document numbering
+more than 100, you must either include a machine-readable Transparent
+copy along with each Opaque copy, or state in or with each Opaque copy
+a computer-network location from which the general network-using
+public has access to download using public-standard network protocols
+a complete Transparent copy of the Document, free of added material.
+If you use the latter option, you must take reasonably prudent steps,
+when you begin distribution of Opaque copies in quantity, to ensure
+that this Transparent copy will remain thus accessible at the stated
+location until at least one year after the last time you distribute an
+Opaque copy (directly or through your agents or retailers) of that
+edition to the public.
+
+It is requested, but not required, that you contact the authors of the
+Document well before redistributing any large number of copies, to give
+them a chance to provide you with an updated version of the Document.
+
+@item
+MODIFICATIONS
+
+You may copy and distribute a Modified Version of the Document under
+the conditions of sections 2 and 3 above, provided that you release
+the Modified Version under precisely this License, with the Modified
+Version filling the role of the Document, thus licensing distribution
+and modification of the Modified Version to whoever possesses a copy
+of it.  In addition, you must do these things in the Modified Version:
+
+@enumerate A
+@item
+Use in the Title Page (and on the covers, if any) a title distinct
+from that of the Document, and from those of previous versions
+(which should, if there were any, be listed in the History section
+of the Document).  You may use the same title as a previous version
+if the original publisher of that version gives permission.
+
+@item
+List on the Title Page