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Revision as of 15:26, 21 April 2021 by Mgautierfr (talk | contribs) (Add Illustration metadata.)
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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.


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 create 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
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] yes A png image (resolution [height] by [width]) to illustrate the zim file.

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

`Illustration_48x48` is mandatory. Others are optional.

Favicon (Old zim file)

Old zim file my 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