# HG changeset patch
# User David Scott <dave.scott@xxxxxxxxxxxxx>
# Date 1271414672 -3600
# Node ID ad754527bddd1c97d28fbffb1c30f56e49178252
# Parent 36c5ecfdb70f3973b99d5d52ed89a828e16cd5a3
Add a basic skeleton of a deprecation policy for the XenAPI.
There's lots of missing detail; feedback is essential!
Signed-off-by: David Scott <dave.scott@xxxxxxxxxxxxx>
diff -r 36c5ecfdb70f -r ad754527bddd docs/evolution/Makefile
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/evolution/Makefile Fri Apr 16 11:44:32 2010 +0100
@@ -0,0 +1,4 @@
+default:
+ pdflatex main.tex
+ pdflatex main.tex
+
diff -r 36c5ecfdb70f -r ad754527bddd docs/evolution/coversheet.tex
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/evolution/coversheet.tex Fri Apr 16 11:44:32 2010 +0100
@@ -0,0 +1,42 @@
+%
+% Copyright (c) 2009 Citrix Systems Inc.
+% This file is covered by the version 1.2 of the GNU Free Documentation
License (see fdl.tex)
+%
+
+\pagestyle{empty}
+
+\doctitle{} \hfill \revstring{}
+
+\vspace{1cm}
+
+\begin{center}
+%\resizebox{8cm}{!}{\includegraphics{\coversheetlogo}}
+
+\vspace{2cm}
+
+\begin{Huge}
+ \doctitle{}
+\end{Huge}
+
+\vspace{1cm}
+\begin{Large}
+Version: \revstring{}\\
+Date: \datestring{}
+\\
+\releasestatement{}
+
+\vspace{1cm}
+\begin{tabular}{rl}
+\docauthors{}
+\end{tabular}
+\end{Large}
+\end{center}
+\vspace{.5cm}
+
+\vfill
+
+\noindent
+\legalnotice{}
+
+\newpage
+\pagestyle{fancy}
diff -r 36c5ecfdb70f -r ad754527bddd docs/evolution/fdl.tex
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/evolution/fdl.tex Fri Apr 16 11:44:32 2010 +0100
@@ -0,0 +1,488 @@
+\chapter{GNU Free Documentation License}
+%\label{label_fdl}
+
+ \begin{center}
+
+ Version 1.2, November 2002
+
+
+ Copyright \copyright 2000,2001,2002 Free Software Foundation, Inc.
+
+ \bigskip
+
+ 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+ \bigskip
+
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+\end{center}
+
+
+\begin{center}
+{\bf\large Preamble}
+\end{center}
+
+The purpose of this License is to make a manual, textbook, or other
+functional and useful 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 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.
+
+
+\begin{center}
+{\Large\bf 1. APPLICABILITY AND DEFINITIONS}
+\addcontentsline{toc}{section}{1. APPLICABILITY AND DEFINITIONS}
+\end{center}
+
+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 \textbf{"Document"}, below,
+refers to any such manual or work. Any member of the public is a
+licensee, and is addressed as \textbf{"you"}. You accept the license if you
+copy, modify or distribute the work in a way requiring permission
+under copyright law.
+
+A \textbf{"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 \textbf{"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 \textbf{"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 \textbf{"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 \textbf{"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 \textbf{"Opaque"}.
+
+Examples of suitable formats for 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.
+
+The \textbf{"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 \textbf{"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 \textbf{"Acknowledgements"},
+\textbf{"Dedications"}, \textbf{"Endorsements"}, or \textbf{"History"}.)
+To \textbf{"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.
+
+
+\begin{center}
+{\Large\bf 2. VERBATIM COPYING}
+\addcontentsline{toc}{section}{2. VERBATIM COPYING}
+\end{center}
+
+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.
+
+
+\begin{center}
+{\Large\bf 3. COPYING IN QUANTITY}
+\addcontentsline{toc}{section}{3. COPYING IN QUANTITY}
+\end{center}
+
+
+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.
+
+
+\begin{center}
+{\Large\bf 4. MODIFICATIONS}
+\addcontentsline{toc}{section}{4. MODIFICATIONS}
+\end{center}
+
+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:
+
+\begin{itemize}
+\item[A.]
+ 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[B.]
+ List on the Title Page, as authors, one or more persons or entities
+ responsible for authorship of the modifications in the 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.
+
+\item[C.]
+ State on the Title page the name of the publisher of the
+ Modified Version, as the publisher.
+
+\item[D.]
+ Preserve all the copyright notices of the Document.
+
+\item[E.]
+ Add an appropriate copyright notice for your modifications
+ adjacent to the other copyright notices.
+
+\item[F.]
+ Include, immediately after the copyright notices, a license notice
+ giving the public permission to use the Modified Version under the
+ terms of this License, in the form shown in the Addendum below.
+
+\item[G.]
+ Preserve in that license notice the full lists of Invariant Sections
+ and required Cover Texts given in the Document's license notice.
+
+\item[H.]
+ Include an unaltered copy of this License.
+
+\item[I.]
+ Preserve the section Entitled "History", Preserve its Title, and add
+ to it an item stating at least the title, year, new authors, and
+ publisher of the Modified Version as given on the Title Page. If
+ there is no section Entitled "History" in the Document, create one
+ stating the title, year, authors, and publisher of the Document as
+ given on its Title Page, then add an item describing the Modified
+ Version as stated in the previous sentence.
+
+\item[J.]
+ Preserve the network location, if any, given in the Document for
+ public access to a 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 "History" 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.
+
+\item[K.]
+ For any section Entitled "Acknowledgements" or "Dedications",
+ 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.
+
+\item[L.]
+ Preserve all the 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.
+
+\item[M.]
+ Delete any section Entitled "Endorsements". Such a section
+ may not be included in the Modified Version.
+
+\item[N.]
+ Do not retitle any existing section to be Entitled "Endorsements"
+ or to conflict in title with any Invariant Section.
+
+\item[O.]
+ Preserve any Warranty Disclaimers.
+\end{itemize}
+
+If the Modified Version includes new front-matter sections or
+appendices that qualify as Secondary Sections 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 Invariant Sections in the Modified Version's license notice.
+These titles must be distinct from any other section titles.
+
+You may add a section Entitled "Endorsements", provided it contains
+nothing but endorsements of your Modified Version by various
+parties--for example, statements of peer review or that the text has
+been approved by an organization as the authoritative definition of a
+standard.
+
+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 Cover Texts in the 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.
+
+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 Modified Version.
+
+
+\begin{center}
+{\Large\bf 5. COMBINING DOCUMENTS}
+\addcontentsline{toc}{section}{5. COMBINING DOCUMENTS}
+\end{center}
+
+
+You may combine the Document with other documents released under this
+License, under the terms defined in section 4 above for modified
+versions, provided that you include in the combination all of the
+Invariant Sections of all of the original documents, unmodified, and
+list them all as Invariant Sections of your combined work in its
+license notice, and that you preserve all their Warranty Disclaimers.
+
+The combined work need only contain one copy of this License, and
+multiple identical Invariant Sections may be replaced with a single
+copy. If there are multiple 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
+Invariant Sections in the license notice of the combined work.
+
+In the combination, you must combine any sections Entitled "History"
+in the various original documents, forming one section Entitled
+"History"; likewise combine any sections Entitled "Acknowledgements",
+and any sections Entitled "Dedications". You must delete all sections
+Entitled "Endorsements".
+
+\begin{center}
+{\Large\bf 6. COLLECTIONS OF DOCUMENTS}
+\addcontentsline{toc}{section}{6. COLLECTIONS OF DOCUMENTS}
+\end{center}
+
+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.
+
+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.
+
+
+\begin{center}
+{\Large\bf 7. AGGREGATION WITH INDEPENDENT WORKS}
+\addcontentsline{toc}{section}{7. AGGREGATION WITH INDEPENDENT WORKS}
+\end{center}
+
+
+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 "aggregate" 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.
+
+If the Cover Text requirement of section 3 is applicable to these
+copies of the Document, then if the Document is less than one half of
+the entire aggregate, the Document's 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.
+
+
+\begin{center}
+{\Large\bf 8. TRANSLATION}
+\addcontentsline{toc}{section}{8. TRANSLATION}
+\end{center}
+
+
+Translation is considered a kind of modification, so you may
+distribute translations of the Document under the terms of section 4.
+Replacing Invariant Sections with translations requires special
+permission from their copyright holders, but you may include
+translations of some or all Invariant Sections in addition to the
+original versions of these 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.
+
+If a section in the Document is Entitled "Acknowledgements",
+"Dedications", or "History", the requirement (section 4) to Preserve
+its Title (section 1) will typically require changing the actual
+title.
+
+
+\begin{center}
+{\Large\bf 9. TERMINATION}
+\addcontentsline{toc}{section}{9. TERMINATION}
+\end{center}
+
+
+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.
+
+
+\begin{center}
+{\Large\bf 10. FUTURE REVISIONS OF THIS LICENSE}
+\addcontentsline{toc}{section}{10. FUTURE REVISIONS OF THIS LICENSE}
+\end{center}
+
+
+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
+http://www.gnu.org/copyleft/.
+
+Each version of the License is given a distinguishing version number.
+If the Document specifies that a particular numbered version of this
+License "or any later version" 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.
+
+
+\begin{center}
+{\Large\bf ADDENDUM: How to use this License for your documents}
+\addcontentsline{toc}{section}{ADDENDUM: How to use this License for your
documents}
+\end{center}
+
+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:
+
+\bigskip
+\begin{quote}
+ Copyright \copyright 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 "GNU
+ Free Documentation License".
+\end{quote}
+\bigskip
+
+If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
+replace the "with...Texts." line with this:
+
+\bigskip
+\begin{quote}
+ with the Invariant Sections being LIST THEIR TITLES, with the
+ Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
+\end{quote}
+\bigskip
+
+If you have Invariant Sections without Cover Texts, or some other
+combination of the three, merge those two alternatives to suit the
+situation.
+
+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.
diff -r 36c5ecfdb70f -r ad754527bddd docs/evolution/globals.tex
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/evolution/globals.tex Fri Apr 16 11:44:32 2010 +0100
@@ -0,0 +1,26 @@
+%
+
+\newcommand{\xapi}{\textsc{XAPI}}
+\newcommand{\xen}{\textsc{Xen}}
+%% Document title
+\newcommand{\doctitle}{Evolving the XenAPI}
+
+%% Document date
+\newcommand{\datestring}{5th April 2010}
+
+\newcommand{\releasestatement}{Comments are welcome!}
+
+%% Document revision
+\newcommand{\revstring}{Document Revision 0.1}
+
+%% Document authors
+\newcommand{\docauthors}{
+David Scott: & {\tt dave.scott@xxxxxxxxxxxxx}}
+\newcommand{\legalnotice}{Copyright \copyright{} 2010 Citrix, Inc.\\ \\
+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 "GNU Free Documentation License".
+}
+
diff -r 36c5ecfdb70f -r ad754527bddd docs/evolution/main.tex
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/evolution/main.tex Fri Apr 16 11:44:32 2010 +0100
@@ -0,0 +1,70 @@
+%
+
+\documentclass{article}
+
+\usepackage{a4wide}
+\usepackage{graphics}
+\usepackage{longtable}
+\usepackage{fancyhdr}
+\usepackage{url}
+
+\newcommand{\eqdef}{\stackrel{def}{=}}
+
+\setlength\topskip{0cm}
+\setlength\topmargin{0cm}
+\setlength\oddsidemargin{0cm}
+\setlength\evensidemargin{0cm}
+%\setlength\parindent{0pt}
+
+\input{globals}
+
+\begin{document}
+
+% The coversheet itself
+\include{coversheet}
+
+% ... and off we go!
+
+\section{Introduction}
+All APIs evolve as bugs are fixed, new features added and features are removed
-- the XenAPI is no exception. This document lists policies describing how the
XenAPI evolves over time.
+
+The goals of XenAPI evolution are:
+\begin{itemize}
+\item to allow bugs to be fixed efficiently\footnote{Some would consider even
a bugfix to be a semantic change which breaks backwards compatability -- what
if someone is relying on the buggy behaviour?};
+\item to allow new, innovative features to be added easily;
+\item to keep old, unmodified clients working as much as possible; and
+\item where backwards-incompatable changes are to be made, publish this
information early to enable affected parties to give timely feedback.
+\end{itemize}
+
+\section{Background}
+In this document, the term ``XenAPI'' refers to the XMLRPC-derived wire
protocol used by xapi. The XenAPI has ``objects'' which each have ``fields''
and ``messages''. The XenAPI is described in detail elsewhere.
+
+\section{Deprecation policy v1}
+\begin{enumerate}
+
+\item XenAPI ``fields'' and ``messages'' may be marked as
+\begin{verbatim}
+deprecated_since <release>
+\end{verbatim}
+where \texttt{release} identifies a major release of the software.
+
+\item Every release must be accomponied by a {\em deprecation statement} which
lists all fields and messages marked as deprecated in the release. Next to each
deprecated item should be an explanation of how to modify a client to avoid
using the deprecated field or message.
+
+\item The deprecation statement shall be prominently displayed in the XenAPI
html documentation.
+
+\item Fields and messages marked as deprecated will continue to exist for at
least one more major software release.
+
+\item Eventually the deprecated fields and messages will be deleted.
+\end{enumerate}
+
+\subsection{Shortcomings of this policy}
+\begin{itemize}
+\item The current policy deals only with syntax (presence/absence of fields
and messages) but not semantics. We still need a way to communicate semantic
changes.
+\item Some changes are issued quickly between major software releases (e.g.\
security hotfixes). We need a way to publish this information quickly.
+
+\item Perhaps we should guarantee fields and messages should live for some
period of wallclock time rather than talk about major releases?
+\end{itemize}
+
+\include{fdl}
+
+\end{document}
5 files changed, 630 insertions(+)
docs/evolution/Makefile | 4
docs/evolution/coversheet.tex | 42 +++
docs/evolution/fdl.tex | 488 +++++++++++++++++++++++++++++++++++++++++
docs/evolution/globals.tex | 26 ++
docs/evolution/main.tex | 70 +++++
xen-api.hg.patch
Description: Text Data
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