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+<appendix id="licenses-gfdl">
+
+    <title>GNU Free Documentation License</title>
+
+    <para>Version 1.2, November 2002</para>
+
+    <para>Copyright &copy; 2000, 2001, 2002 Free Software Foundation,
+    Inc.  675 Mass Ave, Cambridge, MA 02139, USA</para>
+
+    <para>Everyone is permitted to copy and distribute verbatim copies
+    of this license document, but changing it is not allowed.</para>
+
+    <sect1 id="licenses-gfdl-section-1" xreflabel="Preamble">
+
+        <title>Preamble</title>
+
+        <para>The purpose of this License is to make a manual,
+        textbook, or other functional and useful document
+        <quote>free</quote> 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.</para>
+    
+        <para>This License is a kind of <quote>copyleft</quote>, which
+        means that derivative works of the document must themselves be
+        free in the same sense.  It complements the <xref
+        linkend="licenses-gfdl" />, which is a copyleft license
+        designed for free software.</para>
+    
+        <para>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.</para>
+    
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-2" xreflabel="Applicability and definitions">
+    
+        <title>Applicability and definitions</title>
+        
+        <para>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 <quote>Document</quote>, below, refers to
+        any such manual or work.  Any member of the public is a
+        licensee, and is addressed as <quote>you</quote>.  You accept
+        the license if you copy, modify or distribute the work in a
+        way requiring permission under copyright law.</para>
+        
+        <para id="modified-version" xreflabel="Modified Version">A
+        <quote>Modified Version</quote> 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.</para>
+        
+        <para id="secondary-section" xreflabel="Secondary Section">A
+        <quote>Secondary Section</quote> 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 <xref linkend="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.</para>
+        
+        <para id="invariant-sections" xreflabel="Invariant
+        Sections">The <quote>Invariant Sections</quote> are certain
+        <xref linkend="secondary-section" /> 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 Section then
+        there are none.</para>
+        
+        <para id="cover-texts" xreflabel="Cover Texts">The
+        <quote>Cover Texts</quote> 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.</para>
+        
+        <para id="transparent" xreflabel="Transparent">A
+        <quote>Transparent</quote> 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 <xref linkend="transparent" /> file format whose
+        markup, or absence of markup, has been arranged to thwart or
+        discourage subsequent modification by readers is not <xref
+        linkend="transparent" />.  An image format is not <xref
+        linkend="transparent" /> if used for any substantial amount of
+        text.  A copy that is not <quote><xref linkend="transparent"
+        /></quote> is called <quote>Opaque</quote>.</para>
+        
+        <para>Examples of suitable formats for <xref linkend="transparent" /> copies
+        include plain ASCII without markup, Texinfo input format,
+        LaTeX input format, SGML or XML using a publicly available
+        DTD, and standard-conforming simple HTML, PostScript or PDF
+        designed for human modification.  Examples of transparent
+        image formats include PNG, XCF and JPG.  Opaque formats
+        include proprietary formats that can be read and edited only
+        by proprietary word processors, SGML or XML for which the DTD
+        and/or processing tools are not generally available, and the
+        machine-generated HTML, PostScript or PDF produced by some
+        word processors for output purposes only.</para>
+        
+        <para id="title-page" xreflabel="Title Page">The <quote>Title
+        Page</quote> 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,
+        <quote>Title Page</quote> means the text near the most
+        prominent appearance of the work's title, preceding the
+        beginning of the body of the text.</para>
+        
+        <para>A section <quote>Entitled XYZ</quote> 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 <quote>Acknowledgements</quote>,
+        <quote>Dedications</quote>, <quote>Endorsements</quote>, or
+        <quote>History</quote>.) To <quote>Preserve the Title</quote>
+        of such a section when you modify the Document means that it
+        remains a section <quote>Entitled XYZ</quote> according to
+        this definition.</para>
+        
+        <para>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.</para>
+    
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-3" xreflabel="Verbatim copying">
+
+        <title>Verbatim copying</title>
+
+        <para>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 <xref linkend="licenses-gfdl-section-4"
+        />.</para>
+    
+        <para>You may also lend copies, under the same conditions
+        stated above, and you may publicly display copies.</para>
+
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-4" xreflabel="Copying in quantity">
+
+        <title>Copying in quantity</title>
+
+        <para>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 <xref linkend="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.</para>
+    
+        <para>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.</para>
+    
+        <para>If you publish or distribute Opaque copies of the
+        Document numbering more than 100, you must either include a
+        machine-readable <xref linkend="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 <xref linkend="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 <xref linkend="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.</para>
+    
+        <para>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.</para>
+    
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-5" xreflabel="Modification">
+
+        <title>Modifications</title>
+
+        <para>You may copy and distribute a <xref
+        linkend="modified-version" /> of the Document under the
+        conditions of sections <xref linkend="licenses-gfdl-section-3"
+        /> and <xref linkend="licenses-gfdl-section-4" /> above,
+        provided that you release the <xref linkend="modified-version"
+        /> under precisely this License, with the <xref
+        linkend="modified-version" /> filling the role of the
+        Document, thus licensing distribution and modification of the
+        <xref linkend="modified-version" /> to whoever possesses a
+        copy of it.  In addition, you must do these things in the
+        <xref linkend="modified-version" />:
+
+        <orderedlist numeration="upperalpha">
+    
+            <listitem>
+                <para>Use in the <xref linkend="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.</para> </listitem>
+
+            <listitem>
+                <para>List on the <xref linkend="title-page" />, as
+                authors, one or more persons or entities responsible
+                for authorship of the modifications in the <xref
+                linkend="modified-version" />, together with at least
+                five of the principal authors of the Document (all of
+                its principal authors, if it has fewer than five),
+                unless they release you from this requirement.</para>
+            </listitem>
+
+            <listitem>
+                <para>State on the <xref linkend="title-page" /> the
+                name of the publisher of the <xref
+                linkend="modified-version" />, as the
+                publisher.</para>
+            </listitem>
+    
+            <listitem>
+                <para>Preserve all the copyright notices of the
+                Document.</para>
+            </listitem>
+
+            <listitem>
+                <para>Add an appropriate copyright notice for your
+                modifications adjacent to the other copyright
+                notices.</para>
+            </listitem>
+
+            <listitem>
+                <para>Include, immediately after the copyright
+                notices, a license notice giving the public permission
+                to use the <xref linkend="modified-version" /> under the terms of this
+                License, in the form shown in the Addendum
+                below.</para>
+            </listitem>
+
+            <listitem>
+                <para>Preserve in that license notice the full lists
+                of <xref linkend="invariant-sections" /> and required
+                <xref linkend="cover-texts" /> given in the Document's
+                license notice.</para>
+            </listitem>
+
+            <listitem>
+                <para>Include an unaltered copy of this License.</para>
+            </listitem>
+
+            <listitem>
+              <para>Preserve the section Entitled
+              <quote>History</quote>, Preserve its Title, and add to
+              it an item stating at least the title, year, new
+              authors, and publisher of the <xref
+              linkend="modified-version" /> as given on the <xref
+              linkend="title-page" />.  If there is no section
+              Entitled <quote>History</quote> in the Document, create
+              one stating the title, year, authors, and publisher of
+              the Document as given on its <xref linkend="title-page"
+              />, then add an item describing the <xref
+              linkend="modified-version" /> as stated in the previous
+              sentence.</para>
+            </listitem>
+
+            <listitem>
+                <para>Preserve the network location, if any, given in
+                the Document for public access to a <xref
+                linkend="transparent" /> copy of the Document, and
+                likewise the network locations given in the Document
+                for previous versions it was based on.  These may be
+                placed in the <quote>History</quote> section.  You may
+                omit a network location for a work that was published
+                at least four years before the Document itself, or if
+                the original publisher of the version it refers to
+                gives permission.</para>
+            </listitem>
+
+            <listitem>
+                <para>For any section Entitled
+                <quote>Acknowledgements</quote> or
+                <quote>Dedications</quote>, Preserve the Title of the
+                section, and preserve in the section all the substance
+                and tone of each of the contributor acknowledgements
+                and/or dedications given therein.</para>
+            </listitem>
+
+            <listitem>
+                <para>Preserve all the <xref
+                linkend="invariant-sections" /> of the Document,
+                unaltered in their text and in their titles.  Section
+                numbers or the equivalent are not considered part of
+                the section titles.</para>
+            </listitem>
+
+            <listitem>
+                <para>Delete any section Entitled
+                <quote>Endorsements</quote>.  Such a section may not
+                be included in the <xref linkend="modified-version" />.</para>
+            </listitem>
+
+            <listitem>
+                <para>Do not retitle any existing section to be
+                Entitled <quote>Endorsements</quote> or to conflict in
+                title with any <xref linkend="invariant-sections"
+                />.</para> </listitem>
+
+            <listitem>
+                <para>Preserve any Warranty Disclaimers.</para>
+            </listitem>
+        </orderedlist>
+        </para>
+    
+        <para>If the <xref linkend="modified-version" /> includes new
+        front-matter sections or appendices that qualify as <xref
+        linkend="secondary-section" /> and contain no material copied
+        from the Document, you may at your option designate some or
+        all of these sections as invariant.  To do this, add their
+        titles to the list of <xref linkend="invariant-sections"/> in the <xref
+        linkend="modified-version" />'s license notice.  These titles
+        must be distinct from any other section titles.</para>
+    
+        <para>You may add a section Entitled
+        <quote>Endorsements</quote>, provided it contains nothing but
+        endorsements of your <xref linkend="modified-version" /> by various
+        parties&ndash;for example, statements of peer review or that
+        the text has been approved by an organization as the
+        authoritative definition of a standard.</para>
+    
+        <para>You may add a passage of up to five words as a
+        Front-Cover Text, and a passage of up to 25 words as a
+        Back-Cover Text, to the end of the list of <xref
+        linkend="cover-texts"/> in the <xref
+        linkend="modified-version" />.  Only one passage of
+        Front-Cover Text and one of Back-Cover Text may be added by
+        (or through arrangements made by) any one entity.  If the
+        Document already includes a cover text for the same cover,
+        previously added by you or by arrangement made by the same
+        entity you are acting on behalf of, you may not add another;
+        but you may replace the old one, on explicit permission from
+        the previous publisher that added the old one.</para>
+    
+        <para>The author(s) and publisher(s) of the Document do not by
+        this License give permission to use their names for publicity
+        for or to assert or imply endorsement of any <xref
+        linkend="modified-version" />.</para>
+    
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-6" xreflabel="Combining documents">
+
+        <title>Combining documents</title>
+
+        <para>You may combine the Document with other documents
+        released under this License, under the terms defined in
+        section <xref linkend="licenses-gfdl-section-5" /> above for
+        modified versions, provided that you include in the
+        combination all of the <xref linkend="invariant-sections"/> of
+        all of the original documents, unmodified, and list them all
+        as <xref linkend="invariant-sections"/> of your combined work
+        in its license notice, and that you preserve all their
+        Warranty Disclaimers.</para>
+    
+        <para>The combined work need only contain one copy of this
+        License, and multiple identical <xref
+        linkend="invariant-sections"/> may be replaced with a single
+        copy.  If there are multiple <xref
+        linkend="invariant-sections" /> with the same name but
+        different contents, make the title of each such section unique
+        by adding at the end of it, in parentheses, the name of the
+        original author or publisher of that section if known, or else
+        a unique number.  Make the same adjustment to the section
+        titles in the list of <xref linkend="invariant-sections" /> in
+        the license notice of the combined work.</para>
+    
+        <para>In the combination, you must combine any sections
+        Entitled <quote>History</quote> in the various original
+        documents, forming one section Entitled
+        <quote>History</quote>; likewise combine any sections Entitled
+        <quote>Acknowledgements</quote>, and any sections Entitled
+        <quote>Dedications</quote>.  You must delete all sections
+        Entitled <quote>Endorsements</quote>.</para>
+    
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-7" xreflabel="Collection of documents">
+
+        <title>Collection of documents</title>
+
+        <para>You may make a collection consisting of the Document and
+        other documents released under this License, and replace the
+        individual copies of this License in the various documents
+        with a single copy that is included in the collection,
+        provided that you follow the rules of this License for
+        verbatim copying of each of the documents in all other
+        respects.</para>
+    
+        <para>You may extract a single document from such a
+        collection, and distribute it individually under this License,
+        provided you insert a copy of this License into the extracted
+        document, and follow this License in all other respects
+        regarding verbatim copying of that document.</para>
+    
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-8" xreflabel="Aggregation with independent works">
+
+        <title>Aggregation with independent works</title>
+    
+        <para>A compilation of the Document or its derivatives with
+        other separate and independent documents or works, in or on a
+        volume of a storage or distribution medium, is called an
+        <quote>aggregate</quote> if the copyright resulting from the
+        compilation is not used to limit the legal rights of the
+        compilation's users beyond what the individual works permit.
+        When the Document is included in an aggregate, this License
+        does not apply to the other works in the aggregate which are
+        not themselves derivative works of the Document.</para>
+    
+        <para>If the Cover Text requirement of section <xref
+        linkend="licenses-gfdl-section-4" /> is applicable to these
+        copies of the Document, then if the Document is less than one
+        half of the entire aggregate, the Document's <xref
+        linkend="cover-texts" /> may be placed on covers that bracket
+        the Document within the aggregate, or the electronic
+        equivalent of covers if the Document is in electronic form.
+        Otherwise they must appear on printed covers that bracket the
+        whole aggregate.</para>
+    
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-9" xreflabel="Translations">
+
+        <title>Translations</title>
+
+        <para>Translation is considered a kind of modification, so you
+        may distribute translations of the Document under the terms of
+        section <xref linkend="licenses-gfdl-section-5"/>.  Replacing
+        <xref linkend="invariant-sections" />with translations
+        requires special permission from their copyright holders, but
+        you may include translations of some or all <xref
+        linkend="invariant-sections" /> in addition to the original
+        versions of these <xref linkend="invariant-sections" />.  You
+        may include a translation of this License, and all the license
+        notices in the Document, and any Warranty Disclaimers,
+        provided that you also include the original English version of
+        this License and the original versions of those notices and
+        disclaimers.  In case of a disagreement between the
+        translation and the original version of this License or a
+        notice or disclaimer, the original version will
+        prevail.</para>
+
+        <para>If a section in the Document is Entitled
+        <quote>Acknowledgements</quote>, <quote>Dedications</quote>,
+        or <quote>History</quote>, the requirement (section <xref
+        linkend="licenses-gfdl-section-5" />) to Preserve its Title
+        (section <xref linkend="licenses-gfdl-section-2" />) will
+        typically require changing the actual title.</para>
+
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-10" xreflabel="Tremination">
+
+        <title>Termination</title>
+
+        <para>You may not copy, modify, sublicense, or distribute the
+        Document except as expressly provided for under this License.
+        Any other attempt to copy, modify, sublicense or distribute
+        the Document is void, and will automatically terminate your
+        rights under this License.  However, parties who have received
+        copies, or rights, from you under this License will not have
+        their licenses terminated so long as such parties remain in
+        full compliance.</para>
+
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-11" xreflabel="Future Revisions of this License">
+
+        <title>Future Revisions of this License</title>
+
+        <para>The Free Software Foundation may publish new, revised
+        versions of the GNU Free Documentation License from time to
+        time.  Such new versions will be similar in spirit to the
+        present version, but may differ in detail to address new
+        problems or concerns.  See <ulink
+        url="http://www.gnu.org/copyleft/" />.</para>
+
+        <para>Each version of the License is given a distinguishing
+        version number.  If the Document specifies that a particular
+        numbered version of this License <quote>or any later
+        version</quote> applies to it, you have the option of
+        following the terms and conditions either of that specified
+        version or of any later version that has been published (not
+        as a draft) by the Free Software Foundation.  If the Document
+        does not specify a version number of this License, you may
+        choose any version ever published (not as a draft) by the Free
+        Software Foundation.</para>
+
+    </sect1>
+
+    <sect1 id="licenses-gfdl-section-12" xreflabel="How to use this License for your documents">
+
+        <title>How to use this License for your documents</title>
+
+        <para>To use this License in a document you have written,
+        include a copy of the License in the document and put the
+        following copyright and license notices just after the title
+        page:</para>
+
+<programlisting>
+Copyright (C)  YEAR  YOUR NAME.
+
+Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License,
+Version 1.2 or any later version published by the Free Software
+Foundation; with no Invariant Sections, no Front-Cover Texts, and
+no Back-Cover Texts.  A copy of the license is included in the
+section entitled <quote>GNU Free Documentation License</quote>.
+</programlisting>
+
+        <para>If you have <xref linkend="invariant-sections" />,
+        Front-Cover Texts and Back-Cover Texts, replace the
+        <quote>with...Texts</quote>.  line with this:</para>
+
+<programlisting>
+with the Invariant Sections being LIST THEIR TITLES, with the
+Front-Cover Texts being LIST, and with the Back-Cover Texts being
+LIST.
+</programlisting>
+
+        <para>If you have <xref linkend="invariant-sections" />
+        without <xref linkend="cover-texts" />, or some other
+        combination of the three, merge those two alternatives to suit
+        the situation.</para>
+
+        <para>If your document contains nontrivial examples of program
+        code, we recommend releasing these examples in parallel under
+        your choice of free software license, such as the GNU General
+        Public License, to permit their use in free software.</para>
+
+    </sect1>
+
+</appendix>