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Clean Url (plugin for Omeka)

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Clean Url is a plugin for Omeka that creates clean, readable and search engine optimized URLs like instead of Used identifiers come from standard Dublin Core metadata, or from a specific field, so they are easy to manage.

See the example of the digitized heritage of the library of Mines ParisTech.

This plugin is upgradable to Omeka S via the plugin Upgrade to Omeka S, that installs the module Clean Url for Omeka S.


Uncompress files and rename plugin folder "CleanUrl".

Then install it like any other Omeka plugin and follow the config instructions.

Automatic test

For testing and debugging, phpunit 5.7 is required. If you don’t have it:

cd tests
php phpunit-5.7.phar


Clean urls are automatically displayed in public theme and they are not used in the admin theme. They are case insensitive.

This module may be used with the module Archive Repertory to set similar paths for real files (collection_identifier / item_identifier / true_filename).


Simply set an identifier for each record in a field. The recommended field is Dublin Core:Identifier. This field should be available for collections, items and files.

  • Identifiers can be any strings with any characters, as long as they don’t contain reserved characters like "/" and "%".
  • To use numbers as identifier is possible but not recommended. if so, it’s recommended that all records have got an identifier.
  • A prefix can be added if you have other data in the same field.
  • A record can have multiple identifiers. The first one will be used to set the default url. Other ones can be used to set alias.
  • If the same identifier is used for multiple records, only the first record can be got. Currently, no check is done when duplicate identifiers are set.
  • Reserved words like "collections", "items", "files", "exhibits", simple pages slugs...) should not be used as identifiers, except if there is a part before them (a main path, a collection identifier or a generic word).
  • If not set, the identifier will be the default id of the record, except for collections, where the original path will be used.

Structure of urls

The configuration page let you choose the structure of paths for collections, items and files.

  • A main path can be added , as "archives" or "library":
  • A generic and persistent part can be added for collections, items and files, for example, or
  • Multiple urls can be set, in particular to have a permalink and a search engine optimized link.
  • If multiple structures of urls are selected, a default one will be used to set the default url. Other ones can be used to get records.

So the configuration of the plugin let you choose among these possible paths:


- / :identifier_collection
- / generic_collection / :identifier_collection
- / main_path / :identifier_collection
- / main_path / generic_collection / :identifier_collection


- / :identifier_item (currently not available)
- / generic_item / :identifier_item
- / :identifier_collection / :identifier_item
- / generic_collection / :identifier_collection / :identifier_item
- / main_path / :identifier_item
- / main_path / generic_item / :identifier_item
- / main_path / :identifier_collection / :identifier_item
- / main_path / generic_collection / :identifier_collection / :identifier_item


- / :identifier_file (currently not available)
- / :identifier_item / :identifier_file (currently not available)
- / generic_file / :identifier_file
- / generic_file / :identifier_item / :identifier_file
- / :identifier_collection / :identifier_file
- / generic_collection / :identifier_collection / :identifier_file
- / :identifier_collection / :identifier_item / :identifier_file
- / generic_collection / :identifier_collection / :identifier_item / :identifier_file
- / main_path / :identifier_file
- / main_path / :identifier_item / :identifier_file
- / main_path / generic_file / :identifier_file
- / main_path / generic_file / :identifier_item / :identifier_file
- / main_path / :identifier_collection / :identifier_file
- / main_path / generic_collection / :identifier_collection / :identifier_file
- / main_path / :identifier_collection / :identifier_item / :identifier_file
- / main_path / generic_collection / :identifier_collection / :identifier_item / :identifier_file

Note: only logical combinations of some of these paths are available together!

Compatibility with other plugins

Clean Url is compatible with all plugins.

Routes to plugins can be added with the filter "clean_url_route_plugins". Then, when ?rp=my_name will be appended to the url, Clean Url will forward the record to the plugin. Query params are kept.

Nevertheless, the default url may be still used in theme. So the theme may need to be modified too.

Internally Managed Routes

The reroute from a clean url to these plugins are included:

Archive Repertory

Use the plugin Archive Repertory if you wish to set similar paths for real files (collection_identifier / item_identifier / true_filename).


Use it at your own risk.

It’s always recommended to backup your files and your databases and to check your archives regularly so you can roll back if needed.


See online issues on the plugin issues page on GitHub.


This plugin is published under the CeCILL v2.1 licence, compatible with GNU/GPL and approved by FSF and OSI.

In consideration of access to the source code and the rights to copy, modify and redistribute granted by the license, users are provided only with a limited warranty and the software’s author, the holder of the economic rights, and the successive licensors only have limited liability.

In this respect, the risks associated with loading, using, modifying and/or developing or reproducing the software by the user are brought to the user’s attention, given its Free Software status, which may make it complicated to use, with the result that its use is reserved for developers and experienced professionals having in-depth computer knowledge. Users are therefore encouraged to load and test the suitability of the software as regards their requirements in conditions enabling the security of their systems and/or data to be ensured and, more generally, to use and operate it in the same conditions of security. This Agreement may be freely reproduced and published, provided it is not altered, and that no provisions are either added or removed herefrom.


Current maintainers:

  • Daniel Berthereau (see Daniel-KM on GitHub)

First version of this plugin has been built for École des Ponts ParisTech. The upgrade for Omeka 2.0 has been built for Mines ParisTech.


  • Copyright Daniel Berthereau, 2012-2018

Initially based on ItemId of Jim Safley (see GitHub ItemId).


Omeka plugin that allows to have clean, searchable and readable URL like instead of







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