Appendix A.

GNU Free Documentation License

Version 1.1, March 2000

Copyright (C) 2000, 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.

1. PREAMBLE

The purpose of this License is to make a manual, textbook, or other written document "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 Li 

cense 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.

2. APPLICABILITY AND DEFINITIONS

This License applies to any manual or other work that contains a notice placed by the copyright

holder saying it can be distributed under the terms of this License. The "Document", below,

refers to any such manual or work. Any member of the public is a licensee, and is addressed as

"you."

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. (For example, 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 con 

nection 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.

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.