Difference between revisions of "Metadata"

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== Keys ==
== Keys ==
{|{{Prettytable}}
{| class="sortable" style="border-width:1px; border-style:solid; border-color:#888888; background-color:#eeeeee; border-collapse:collapse; empty-cells:show" cellspacing="0" cellpadding="4" {{Prettytable}}
! Key    !! Mandatory    !! Description !! Example
! Key    !! Mandatory    !! Description !! Example
|-
! Name
| yes
| A human readable identifier for the resource. It's the same across versions (should be stable across time).
| ''wikipedia_fr_football''
|-
|-
! Title
! Title
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! Creator
! Creator
| yes
| yes
| creator of the ZIM file
| creator(s) of the ZIM file content
| ''English speaking Wikipedia contributors''
| ''English speaking Wikipedia contributors''
|-
! Publisher
| yes
| creator of the ZIM file itself
| ''Wikipedia user Foobar''
|-
|-
! Date
! Date
| yes
| yes
| create date (ISO - YYYY-MM-DD)
| ZIM creation date (ISO - YYYY-MM-DD)
| ''2009-11-21''
| ''2009-11-21''
|-
|-
! Description  
! Description  
| yes
| yes
| description of content
| description of content (one short sentence)
| ''This ZIM file contains all articles (without images) from the english Wikipedia by 2009-11-10.''
| ''All articles (without images) from the english Wikipedia''
|-
! LongDescription
| no
| description of content (small paragraph)
| ''This ZIM file contains all articles (without images) from the english Wikipedia by 2009-11-10. The topics are ...''
|-
|-
! Language
! Language
| yes
| yes
| [http://www.sil.org/iso639-3/codes.asp ISO639-3 language identifier]
| [http://www.sil.org/iso639-3/codes.asp ISO639-3 language identifier] (if many, comma separated)
| ''eng''
| ''eng''
|-
! License
| No
| License code of the content.
| ''CC-BY''
|-
! Tags
| no
| A list of [[tags]]
| ''wikipedia;_category:wikipedia;_pictures:no;_videos:no;_details:yes;_ftindex:yes''
|-
|-
! Relation
! Relation
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| URI of external related ressources
| URI of external related ressources
|  
|  
|-
! Flavour
| no
| A human readable string describing the way how the content has been scraped. It's the same across versions (should be stable across time).
| ''nopic''
|-
|-
! Source
! Source
| no
| no
| URI of the original source
| URI of the original source
| ''http://en.wikipedia.org/''
| ''https://en.wikipedia.org/''
|-
! Counter
| no
| Number of non-redirect entries per mime-type
| image/jpeg=5;image/gif=3;image/png=2;...
|-
! Scraper
| no
| Details about the software used to scrape the content, with its version
| mwoffliner 1.2.3
|-
!Illustration_[height]x[width]@[scale]
|yes
|A png image (resolution [height] by [width]) to illustrate the zim file.
This must be a binary content (png) with mimeytpe `image/png`.
 
We follow the same specification than freedesktop  https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html for the size and scale of the icon.
 
<code>height</code>, <code>width</code>, <code>scale</code> describe the '''target''' size (where the icon is intended to be displayed) :
 
- <code>Illustration_48x48@1</code> is a 48x48 pixels image to be displayed as a 48x48 icon on a scale 1 screen.
 
- <code>Illustration_48x48@2</code> is a 96x96 pixels image to be displayed as a 48x48 icon on a scale 2 screen.
 
- <code>Illustration_96x96@1</code> is a 96x96 pixels image to be displayes as a 96x96 icon on a scale 1 screen.
 
 
<code>Illustration_48x48@1</code> is mandatory. Others are optional.
!
|}
|}


== Favicon ==
== Favicon (Old zim file) ==
 
Old zim file may have a illustration in <code>-/favicon</code> (it can be a redirection to the real content).
 
Reader must be able to read the illustration using this path.


A favicon (48x48) is also mandatory and should be located at /-/favicon
Writer must not set a <code>-/favicon</code>


== See also ==
== See also ==
* [http://dublincore.org/documents/dces/ Dublin Core]
* [http://dublincore.org/documents/dces/ Dublin Core]

Latest revision as of 09:09, 13 April 2022

In order to provide a description to each ZIM file that can be easily extracted we defined a special namespace M and a standardized set of keywords that should be used.

Every key is defined like an article, the key name is used as the article name, the key value is put into the article text. This way also metadata is compressed, but extendable. Further keys could be used in a ZIM file without breaking the standard but please be aware that maybe the openZIM project will define additional keys in the future. Any ZIM library reading this metadata should ignore missing keys / values and just return NULL values in such cases.

Keys

Key Mandatory Description Example
Name yes A human readable identifier for the resource. It's the same across versions (should be stable across time). wikipedia_fr_football
Title yes title of zim file English Wikipedia
Creator yes creator(s) of the ZIM file content English speaking Wikipedia contributors
Publisher yes creator of the ZIM file itself Wikipedia user Foobar
Date yes ZIM creation date (ISO - YYYY-MM-DD) 2009-11-21
Description yes description of content (one short sentence) All articles (without images) from the english Wikipedia
LongDescription no description of content (small paragraph) This ZIM file contains all articles (without images) from the english Wikipedia by 2009-11-10. The topics are ...
Language yes ISO639-3 language identifier (if many, comma separated) eng
License No License code of the content. CC-BY
Tags no A list of tags wikipedia;_category:wikipedia;_pictures:no;_videos:no;_details:yes;_ftindex:yes
Relation no URI of external related ressources
Flavour no A human readable string describing the way how the content has been scraped. It's the same across versions (should be stable across time). nopic
Source no URI of the original source https://en.wikipedia.org/
Counter no Number of non-redirect entries per mime-type image/jpeg=5;image/gif=3;image/png=2;...
Scraper no Details about the software used to scrape the content, with its version mwoffliner 1.2.3
Illustration_[height]x[width]@[scale] yes A png image (resolution [height] by [width]) to illustrate the zim file.

This must be a binary content (png) with mimeytpe `image/png`.

We follow the same specification than freedesktop https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html for the size and scale of the icon.

height, width, scale describe the target size (where the icon is intended to be displayed) :

- Illustration_48x48@1 is a 48x48 pixels image to be displayed as a 48x48 icon on a scale 1 screen.

- Illustration_48x48@2 is a 96x96 pixels image to be displayed as a 48x48 icon on a scale 2 screen.

- Illustration_96x96@1 is a 96x96 pixels image to be displayes as a 96x96 icon on a scale 1 screen.


Illustration_48x48@1 is mandatory. Others are optional.

Favicon (Old zim file)

Old zim file may have a illustration in -/favicon (it can be a redirection to the real content).

Reader must be able to read the illustration using this path.

Writer must not set a -/favicon

See also