Saturday, March 29, 2008

A minimal word document in OOXML format (WordprocessingML)

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I wanted to a first real look at OOXML documents (for Word) and decided to go for a minimal example. Luckily I was not the first to do this so I found several resources, which also gave me a trip around commmandline'in .NET and an aspect of versioning.


The first resource I found was a blog entry by Doug Mahugh called CreateDOCX Sample Program. I downloaded the example code, jumped into the Debug directory and ran the program with the following result:

C:\misc\CreateDOCX\CreateDOCX\bin\Debug>CreateDOCX.exe sx.doc "Hello"

Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'WindowsBase, Version=3.0.51116.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Den angivne fil blev ikke fundet.
File name: 'WindowsBase, Version=3.0.51116.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
   at CreateDOCX.SaveDOCX(String fileName, String BodyText)
   at CreateDOCX.Main() in D:\projects\OpenXmlDeveloper\PackagingAPI\CreateDOCX\CreateDOCX\CreateDOCX.cs:line 26

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

I'm not really sure why there's a dependency on the source file, but I decided to compile it myself from the commandline, with this little batch file:

echo on

set csc="C:\WINDOWS\Microsoft.NET\Framework\v3.5\csc.exe"
set winBase="C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\WindowsBase.dll"

set exe="build\simpleDocx.exe"

del /Q build\*

%csc%  /nologo  /target:exe /reference:%winBase% /out:%exe% CreateDOCX\CreateDOCX.cs

%exe% sx.docx "Hello"

After having run this with success I was ready to open the file with Word 2007, just to get this warning:

After comparing with a similar document created with Word 2007 i found the reason, I should had paid notice to when the article was from (2006) cause the namespace used in the program: isn't what's used in the final version (standardization in progress) which is There's a description of this behaviour in Message when you try to open a file that was saved in a prerelease version of the 2007 Office programs: "This file was created in a previous beta version" or "This workbook was created in an earlier beta version".

As for versioning Word 2007 is aware of this earlier version, and hopefully it's close to the released version since otherwise handling multiple versions can turn out as a big challenge - something that catching up with the standardization process will demand, a situation that in general is hard to handle, having support for multiple versions with possibly different data model and/or semantics.

The simple 'Hello' document shown in Word 2007

A truely minimal document

An better resource is Jesper Lund Stocholms blog entry (in danish): Venstrehåndsarbejde på Version2 where he creates a truely minimal OOXML Word document "Hello World!"-OOXML dockument.

The Ecma Office Open XML File Formats Standard - Primer and whitepaper

Last but not the least the, and had I only read the (proposed) standard ealier I would had known, the Primer [PDF] (Ecma TC45 Final Draft Part 3), has a minimal document in section 2.2 Basic Document Structure.

Also the whitepaper from ECMA TC45 OFFICE OPEN XML OVERVIEW has a minimal example in section 5.6 MINIMAL WORDPROCESSINGML DOCUMENT.

Debugging corrupt documents

Fiddling around with the content/documents in a more complex document/assembly will easily give you this experience when you try to open it in Word 2007:

Document is corrupt prompt from Word 2007

And I guess that is just the risk I have to accept if I alter documents by hand or with just basic support tools, with the only test options in schema validation and trying to open the documents with word or another compliant tool.

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Friday, March 21, 2008

The Anatomy of a yum repository - a look under the hood of the Skype repo for i586

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For a long time I've been a happy user of both up2date and later yum without having any deeper understanding of how it works. Inspired by a couple of comments on my posting Sweetxml: Updating Skype with yum - updated repository location I decided to have a closer look at it. The yum repository that I wrote about was for Skype with the baseurl Making a visit to that URL gives an 403:

$ wget -S
Connecting to||:80... connected.
HTTP request sent, awaiting response...
  HTTP/1.1 403 Forbidden
  Server: nginx/0.5.20
  Date: Tue, 18 Mar 2008 23:01:25 GMT
  Content-Type: text/html
  Content-Length: 1292
  Connection: keep-alive
23:30:03 ERROR 403: Forbidden.

Which could be interpreted as there was something wrong with the repository, but that would be a mis-conclusion. The 403 contains a /html/head/meta[@http-equiv="refresh"] that sendes the browser to

<meta http-equiv="refresh" content="0;url=" />

which will send you through further a couple of 302's :

$ wget -S
Connecting to||:80... connected.
HTTP request sent, awaiting response...
  HTTP/1.1 302 Found
  Date: Tue, 18 Mar 2008 22:36:57 GMT
  Server: Apache
  Vary: Accept-Encoding,User-Agent
  Content-Length: 0
  Keep-Alive: timeout=5, max=1200
  Connection: Keep-Alive
  Content-Type: text/html; charset=utf-8
  Content-Language: en
Location: [following]
Reusing existing connection to
HTTP request sent, awaiting response...
  HTTP/1.1 302 Found
  Date: Tue, 18 Mar 2008 22:36:57 GMT
  Server: Apache
  Pragma: no-cache
  Cache-Control: no-store, no-cache, must-revalidate
  Cache-Control: post-check=0, pre-check=0
  Vary: Accept-Encoding,User-Agent
  Content-Length: 780
  Keep-Alive: timeout=5, max=1199
  Connection: Keep-Alive
  Content-Type: text/html; charset=utf-8
  Content-Language: en
Location: [following]
Reusing existing connection to
HTTP request sent, awaiting response...
  HTTP/1.1 200 OK
  Date: Tue, 18 Mar 2008 22:36:58 GMT
  Server: Apache
  Accept-Ranges: bytes
  Vary: Accept-Encoding,User-Agent
  Connection: close
  Content-Type: text/html; charset=utf-8
  Content-Language: en
Length: unspecified [text/html]

Here ending up on the windows download page (probaly the default, since wget doesn't give enogh OS information).

Looking for some in depth information about yum repositories I had to do more seaching that I had expected, but I finally ended at Duke University Yellow dog Updater, Modified (yum) project and especially createrepo that has a short description of the anatomy of a yum repository in the Explanations section.

The metadata file (for the metadata files) for the repository is located relatively in repodata/repomd.xml which for this repository becomes:

    1 <?xml version="1.0" encoding="UTF-8"?>
    2 <repomd xmlns="">
    3   <data type="other">
    4     <location href="repodata/other.xml.gz" />
    5     <checksum type="sha">289da3573161f83988b15dc74db0a1efa8ef9781</checksum>
    6     <timestamp>1191408972</timestamp>
    7     <open-checksum type="sha">c709dc7b0f3f7c0f38c767ebda5d33979eb2a943</open-checksum>
    8   </data>
    9   <data type="filelists">
   10     <location href="repodata/filelists.xml.gz" />
   11     <checksum type="sha">5c9fa749066ef5799f2ea9159a2963502644ecaa</checksum>
   12     <timestamp>1191408972</timestamp>
   13     <open-checksum type="sha">6eb325e10d4e8fcb091e292c27dd09176cd3aa4d</open-checksum>
   14   </data>
   15   <data type="primary">
   16     <location href="repodata/primary.xml.gz" />
   17     <checksum type="sha">68df664b42a6f6b97baa9f0022a5d2e89f5b95e1</checksum>
   18     <timestamp>1191408972</timestamp>
   19     <open-checksum type="sha">97ef94dac5f6f6a6b610eca8ed48f806d4eaac2d</open-checksum>
   20   </data>
   21 </repomd>

So from this it's clear that this is an active repository, though direct browsing the baseurl could give you the idea that it wasn't.

Taking it in reverse order the primary metadata is in the file repodata/primary.xml.gz, as described on the Duke website:

this file stores the primary metadata information. This includes information such as:

  • name, epoch, version, release, architecture
  • file size, file location, description, summary, format, checksums header byte-ranges, etc.
  • dependencies, provides, conflicts, obsoletes, suggests, recommends
  • file lists for the package for CERTAIN files - specifically files matching: /etc*, *bin/*, /usr/lib/sendmail
  • it also includes a 'format' element which allows for format specific information to be stored. The formats known about right now are deb and rpm

This file (when gunzip'ed) looks like:

    1 <?xml version="1.0" encoding="UTF-8"?>
    2 <metadata
    3   xmlns=""
    4   xmlns:rpm=""
    5   packages="1">
    6   <package type="rpm">
    7     <name>skype</name>
    8     <arch>i586</arch>
    9     <version
   10       epoch="0"
   11       ver=""
   12       rel="fc5" />
   13     <checksum
   14       type="sha"
   15       pkgid="YES">
   16       35d0bb0ed0738c4392827b2cd3d6ad5b1f098506
   17     </checksum>
   18     <summary>Skype is free Internet telephony that just works</summary>
   19     <description>
   20       Skype - Take a deep breath
   22       Skype is a little piece of software that lets you make free calls to anyone else
   23       on Skype, anywhere in the world. And even though the calls are free, they are really
   24       excellent quality.
   26       * Make free Skype-to-Skype calls to anyone else, anywhere in the world.
   27       * Call ordinary phones and mobiles at pretty cheap rates per minute.
   28       * Group chat with up to 100 people or conference call with up to nine others.
   29       * Free to download.
   30     </description>
   31     <packager />
   32     <url></url>
   33     <time
   34       file="1191408970"
   35       build="1190911586" />
   36     <size
   37       package="13410121"
   38       installed="16209093"
   39       archive="16225988" />
   40     <location href="skype-" />
   41     <format>
   42       <rpm:license>Commercial</rpm:license>
   43       <rpm:vendor />
   44       <rpm:group>Applications/Internet</rpm:group>
   45       <rpm:buildhost></rpm:buildhost>
   46       <rpm:sourcerpm>skype-</rpm:sourcerpm>
   47       <rpm:header-range
   48         start="440"
   49         end="25645" />
   50       <rpm:provides>
   51         <rpm:entry
   52           name="config(skype)"
   53           flags="EQ"
   54           epoch="0"
   55           ver=""
   56           rel="fc5" />
   57         <rpm:entry
   58           name="skype"
   59           flags="EQ"
   60           epoch="0"
   61           ver=""
   62           rel="fc5" />
   63       </rpm:provides>
   64       <rpm:requires>
   65         <rpm:entry name="" />
   66         <rpm:entry name="" />
   67         <rpm:entry name="" />
   68         <rpm:entry
   69           name="config(skype)"
   70           flags="EQ"
   71           epoch="0"
   72           ver=""
   73           rel="fc5" />
   74         <rpm:entry name="" />
   75         <rpm:entry name="" />
   76         <rpm:entry name="" />
   77         <rpm:entry name="" />
   78         <rpm:entry name="" />
   79         <rpm:entry
   80           name="rpmlib(PayloadFilesHavePrefix)"
   81           flags="LE"
   82           epoch="0"
   83           ver="4.0"
   84           rel="1"
   85           pre="1" />
   86         <rpm:entry
   87           name="rpmlib(CompressedFileNames)"
   88           flags="LE"
   89           epoch="0"
   90           ver="3.0.4"
   91           rel="1"
   92           pre="1" />
   93         <rpm:entry name="" />
   94         <rpm:entry name="" />
   95         <rpm:entry name="" />
   96         <rpm:entry name="" />
   97         <rpm:entry name="" />
   98         <rpm:entry name="" />
   99         <rpm:entry name="" />
  100         <rpm:entry name="" />
  101         <rpm:entry name="" />
  102         <rpm:entry name="" />
  103         <rpm:entry name="" />
  104         <rpm:entry name="" />
  105         <rpm:entry name="" />
  106         <rpm:entry name="" />
  107         <rpm:entry name="" />
  108         <rpm:entry name="" />
  109         <rpm:entry name="" />
  110         <rpm:entry name="" />
  111         <rpm:entry name="" />
  112         <rpm:entry name="" />
  113         <rpm:entry
  114           name="/bin/sh"
  115           pre="1" />
  116         <rpm:entry
  117           name="qt4-x11"
  118           flags="GE"
  119           epoch="0"
  120           ver="4.2" />
  121         <rpm:entry name="" />
  122         <rpm:entry name="" />
  123         <rpm:entry name="" />
  124         <rpm:entry name="" />
  125         <rpm:entry name="" />
  126       </rpm:requires>
  127       <file>/etc/dbus-1/system.d/skype.conf</file>
  128       <file>/usr/bin/skype</file>
  129     </format>
  130   </package>
  131 </metadata>

The format partly defined in the DTD for package and DTD for rpm metadata.

The repodata/filelists.xml.gz, described as this file stores the complete file and directory listings for the packages. The package is identified by: name, epoch, version, release, architecture and package checksum id contains:

    1 <?xml version="1.0" encoding="UTF-8"?>
    2 <filelists
    3   xmlns=""
    4   packages="1">
    5   <package
    6     pkgid="97ff8fb3b6eb70289a73545ea39c02fcce4f6b4a"
    7     name="skype"
    8     arch="i586">
    9     <version
   10       epoch="0"
   11       ver=""
   12       rel="fc5" />
   13     <file>/etc/dbus-1/system.d/skype.conf</file>
   14     <file>/usr/bin/skype</file>
   15     <file>/usr/share/applications/skype.desktop</file>
   16     <file>/usr/share/doc/skype-</file>
   17     <file>/usr/share/doc/skype-</file>
   18     <file>/usr/share/icons/skype.png</file>
   19     <file>/usr/share/pixmaps/skype.png</file>
   20     <file>/usr/share/skype/lang/skype_bg.qm</file>
   21     <file>/usr/share/skype/lang/skype_bg.ts</file>
   22     <file>/usr/share/skype/lang/skype_de.qm</file>
   23     <file>/usr/share/skype/lang/skype_de.ts</file>
   24     <file>/usr/share/skype/lang/skype_en.qm</file>
   25     <file>/usr/share/skype/lang/skype_en.ts</file>
   26     <file>/usr/share/skype/lang/skype_es.qm</file>
   27     <file>/usr/share/skype/lang/skype_es.ts</file>
   28     <file>/usr/share/skype/lang/skype_et.qm</file>
   29     <file>/usr/share/skype/lang/skype_et.ts</file>
   30     <file>/usr/share/skype/lang/skype_fr.qm</file>
   31     <file>/usr/share/skype/lang/skype_fr.ts</file>
   32     <file>/usr/share/skype/lang/skype_it.qm</file>
   33     <file>/usr/share/skype/lang/skype_it.ts</file>
   34     <file>/usr/share/skype/lang/skype_ja.qm</file>
   35     <file>/usr/share/skype/lang/skype_ja.ts</file>
   36     <file>/usr/share/skype/lang/skype_ko.qm</file>
   37     <file>/usr/share/skype/lang/skype_ko.ts</file>
   38     <file>/usr/share/skype/lang/skype_lt.qm</file>
   39     <file>/usr/share/skype/lang/skype_lt.ts</file>
   40     <file>/usr/share/skype/lang/skype_lv.qm</file>
   41     <file>/usr/share/skype/lang/skype_lv.ts</file>
   42     <file>/usr/share/skype/lang/skype_pl.qm</file>
   43     <file>/usr/share/skype/lang/skype_pl.ts</file>
   44     <file>/usr/share/skype/lang/skype_pt_br.qm</file>
   45     <file>/usr/share/skype/lang/skype_pt_br.ts</file>
   46     <file>/usr/share/skype/lang/skype_pt_pt.qm</file>
   47     <file>/usr/share/skype/lang/skype_pt_pt.ts</file>
   48     <file>/usr/share/skype/lang/skype_ro.qm</file>
   49     <file>/usr/share/skype/lang/skype_ro.ts</file>
   50     <file>/usr/share/skype/lang/skype_ru.qm</file>
   51     <file>/usr/share/skype/lang/skype_ru.ts</file>
   52     <file>/usr/share/skype/lang/skype_th.qm</file>
   53     <file>/usr/share/skype/lang/skype_th.ts</file>
   54     <file>/usr/share/skype/lang/skype_tr.qm</file>
   55     <file>/usr/share/skype/lang/skype_tr.ts</file>
   56     <file>/usr/share/skype/lang/skype_zh_s.qm</file>
   57     <file>/usr/share/skype/lang/skype_zh_s.ts</file>
   58     <file>/usr/share/skype/lang/skype_zh_t.qm</file>
   59     <file>/usr/share/skype/lang/skype_zh_t.ts</file>
   60     <file>/usr/share/skype/sounds/CallBusy.wav</file>
   61     <file>/usr/share/skype/sounds/CallConnecting.wav</file>
   62     <file>/usr/share/skype/sounds/CallFailed.wav</file>
   63     <file>/usr/share/skype/sounds/CallHangup.wav</file>
   64     <file>/usr/share/skype/sounds/CallHold.wav</file>
   65     <file>/usr/share/skype/sounds/CallRemoteHangup.wav</file>
   66     <file>/usr/share/skype/sounds/CallResume.wav</file>
   67     <file>/usr/share/skype/sounds/CallRingingIn.wav</file>
   68     <file>/usr/share/skype/sounds/CallRingingOut.wav</file>
   69     <file>/usr/share/skype/sounds/ChatIncoming.wav</file>
   70     <file>/usr/share/skype/sounds/ChatIncomingInitial.wav</file>
   71     <file>/usr/share/skype/sounds/ChatOutgoing.wav</file>
   72     <file>/usr/share/skype/sounds/ContactAdded.wav</file>
   73     <file>/usr/share/skype/sounds/ContactAuthRequest.wav</file>
   74     <file>/usr/share/skype/sounds/ContactOffline.wav</file>
   75     <file>/usr/share/skype/sounds/ContactOnline.wav</file>
   76     <file>/usr/share/skype/sounds/SkypeLogin.wav</file>
   77     <file>/usr/share/skype/sounds/SkypeLogout.wav</file>
   78     <file>/usr/share/skype/sounds/TransferComplete.wav</file>
   79     <file>/usr/share/skype/sounds/TransferFailed.wav</file>
   80     <file>/usr/share/skype/sounds/TransferRequest.wav</file>
   81     <file>/usr/share/skype/sounds/VoicemailReceived.wav</file>
   82     <file type="dir">/usr/share/doc/skype-</file>
   83   </package>
   85 </filelists>

And finally repodata/other.xml.gz, with the description this file currently only stores the changelog data from packages. However, this file could be used for any other additional metadata that could be useful for clients contains:

    1 <?xml version="1.0" encoding="UTF-8"?>
    2 <otherdata
    3   xmlns=""
    4   packages="1">
    5   <package
    6     pkgid="97ff8fb3b6eb70289a73545ea39c02fcce4f6b4a"
    7     name="skype"
    8     arch="i586">
    9     <version
   10       epoch="0"
   11       ver=""
   12       rel="fc5" />
   13     <changelog
   14       author="Skype Technologies S.A. &lt;;"
   15       date="1204704000">
   16 - feature: Add call cost per minute to 1:1 SkypeOut calls.
   17 - feature: Add UI detection of Slovakian, Farsi (Persian) and Vietnamese language files.
   18 - feature: Added privacy option to disable the sending of the number of contacts you have to your contacts.
   19 - feature: Implement HashLinkURL to provide easy links to #12345 references in chats.
   20 - feature: Shadows on user avatars on contact card.
   21 - feature: Show an indicator when the user is on an embedded device such as a Skype phone.
   22 - feature API: BTN_PRESSED/BTN_RELEASED are now implemented.
   23 - feature API: SEARCH ACTIVECHATS is now implemented.
   24 - bugfix: 1:1 chats should not have Leave Chat button.
   25 - bugfix: Add a blinking window effect for some windows which are already open when we get a new chat message.
   26 - bugfix: Add a workaround for a KWin issue preventing closed minimized chats from being reopened.
   27 - bugfix: Add bubbles from mood message to avatars on contact card.
   28 - bugfix: Add right-click context menu to chat window for copying text/links.
   29 - bugfix: Avoid status text being truncated on status button in profile editor.
   30 - bugfix: BTN_PRESSED YES should activate Call functionality regardless of double-click action.
   31 - bugfix: Be sure the chat window doesn't reappear after we leave the chat.
   32 - bugfix: Call Ringing sound shouldn't be audible during Do Not Disturb status mode.
   33 - bugfix: Can't add a contact to a chat using drag and drop.
   34 - bugfix: Change Call Hold/Resume button at the correct times (even when changing hold/resume during fullscreen video)
   35 - bugfix: Change file transfer filename to saved filename if different from original filename in transfer window.
   36 - bugfix: Compare chats in recent chats/etc menus correctly to check if they are unread.
   37 - bugfix: Contacts shouldn't disappear when they're moved between columns when receiving contacts.
   38 - bugfix: Copy URLs to both X selection and Clipboard, as users may want to middle-click the copied link into their browser.
   39 - bugfix: Crash after 2 minutes of signing in if we are signed out at that time.
   40 - bugfix: Crash after signing in with incorrect details after signing out.
   41 - bugfix: Display video in full-screen at correct aspect ratio regardless of monitor dimensions.
   42 - bugfix: Do not always put new chat windows at top left corner if no previous setting found, let window manager determine position.
   43 - bugfix: Do not freeze when opening options dialog
   44 - bugfix: Do not initialise /dev/video0 whenever we start a video call (could prevent video from working when video0 fails)
   45 - bugfix: Do not instantly close Voicemail events when clicking the play button in new events panel.
   46 - bugfix: Do not let Voicemail messages continue to play in the background after closing them.
   47 - bugfix: Do not show authorisation options in context menu for events if we already authorised the user.
   48 - bugfix: Do not unnecessarily init device twice when starting video (speeds up video init by 50%)
   49 - bugfix: Downscaling for Myself View / Oversized Video on X11 (non-accelerated).
   50 - bugfix: echo123 should be called Skype Test Call and should not have an 'Request Authorization' option.
   51 - bugfix: Ending an incoming conference call should be allowed to redirect to Voicemail also.
   52 - bugfix: Escape should close send contacts window before we attempt to send contacts.
   53 - bugfix: Fix for chat being stuck in unread state after becoming multichat.
   54 - bugfix: Fix for video output when not using XShm extension.
   55 - bugfix: Fix locking up the client for up to 30 seconds randomly sometimes for heavy Skype users.
   56 - bugfix: If main window is thinner than login window and right-aligned, it would move to the left after restart.
   57 - bugfix: Incoming calls should be redirected to Voicemail if configured to do so and another call is active.
   58 - bugfix: Make 'Invite selected contacts to conference call' option work in contact list multiple selections menu.
   59 - bugfix: Make contact list even more responsive whilst loading historical calls.
   60 - bugfix: Make login/startup much faster and cleaner.
   61 - bugfix: Make missed event text for birthdays clearer.
   62 - bugfix: Many bugfixes to video in call window to handle window updates during paused video calls.
   63 - bugfix: Only move main window if we have a previously saved position.
   64 - bugfix: Only play chat message sent sound for actual sent messages and emotive actions.
   65 - bugfix: Only redirect incoming calls to Voicemail if we actually have Voicemail capability.
   66 - bugfix: Properly remember unread chats as unread after a Skype restart.
   67 - bugfix: Receive Contacts should close when Escape is pressed.
   68 - bugfix: Remember 'Show Myself View' setting during the video call (when switching to fullscreen and back, etc).
   69 - bugfix: Remember chat splitter arrangement per user for 1:1 chats.
   70 - bugfix: Remember chat window position per user for 1:1 chats.
   71 - bugfix: Remember show/hide chat member list setting per user for 1:1 chats.
   72 - bugfix: Remove grey contact card background.
   73 - bugfix: Reordered Voicemail Options dialog to keep individual Voicemail features independent.
   74 - bugfix: Send Contacts should cancel and/or close when Escape is pressed.
   75 - bugfix: Shortened SkypeIn and SkypeOut call error messages.
   76 - bugfix: Show correct saving filename in child transfer widget when receiving multiple files.
   77 - bugfix: Shrink myself view so it scales better on Xv and properly on X11.
   78 - bugfix: Starting a conference call with a MySpace contact would result in a single call being made to 'myspace'.
   79 - bugfix: Stop window from moving lower and lower on each restart.
   80 - bugfix: Update chat window area size correctly after clearing to avoid mystery scrollbar returning.
   81 - bugfix: Video call window is out of shape if the contact has a really long name.
   82 - bugfix API: SET CHATMESSAGE [id] SEEN should remove now-read chats from events panel.
   83     </changelog>
   84   </package>
   85 </otherdata>

On there's an article How To Set Up A Local Yum Repository On Fedora 8 which could be a very good idea if I someday had to develop (and maintain) an application for Linux.

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