Antes de añadir un recurso al repositorio, Vazaar intenta encontrar todos los metadatos asociados al mismo. Para ello, vazaar utilizará una o varias bibliotecas que se encarguen de esta función.

Lista de bibliotecas encontradas:

libextractor python bindings for GNU libextractor

• Funcionalidad: probada y verificada. Extrae metadatos de los ficheros pero no están asociados a ninguna ontología.
• Estado: No implementado.
• Características: metadatos que maneja

hachoir-metadata is tool to extract metadata from multimedia files (sound, video, archives, etc.)

• Funcionalidad: no verificada
• Estado: No implementado.

XMP extrae metadatos de ficheros jpeg o pdf y devuelve una cadena en formato RDF/XML.

• Funcionalidad: no verificada
• Estado: no implementado.

python-bitzi is a wrapper around the Bitcollider library from Bitzi. It allows you to extract metadata from different types of files. Using this library you can get the bitprint (tiger tree + sha1), md5, song length, song bit rate, image dimensions.

You can think of Bitzi as the "card catalog" for the heavenly jukebox, holding information about any and every media file that is ever reported to them, not just the files available on the web, or through any particular service, or through any particular sharing/distribution network. Developers of file sharing networks should find this extension useful.

• Funcionalidad: no verificada
• Estado: no implementado.

kaa.metadata is a powerful media metadata parser. It can extract metadata (such as id3 tags, for example) from a wide range of media files. Attributes like codec, length, resolution, audio/video/subtitle tracks, and chapters are also returned. The module has support for the following formats:

• Audio: ac3, dts, flac, mp3 (with id3 tag support), ogg, pcm, m4a, wma.
• Video: avi, mkv, mpg, ogm, asf, wmv, flv, mov, dvd iso, vcd iso.
• Media: vcd, cd, dvd.
• Image: jpeg (with exif and iptc support), bmp, gif, png, tiff.

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• Funcionalidad: no verificada
• Estado: no implementado.

A http://wiki.creativecommons.org/Liblicense for managing license metadata, in particular CC licensing information.

• Funcionalidad: no verificada
• Estado: no implementado.

Tracker is a tool designed to extract information and metadata about your personal data so that it can be searched easily and quickly.

• Funcionalidad: no verificada
• Estado: no implementado.

Pinot is a D-Bus service that crawls, indexes your documents and monitors them for changes and a GTK-based user interface that enables to query the index built by the service and your favourite Web engines, and display and analyze the results.

• Funcionalidad: no verificada
• Estado: no implementado.

Exempi is an implementation of XMP. Version up to 0.5.1 is completely done from scratch and licensed under LGPL.

Version 2.0 will be based on Adobe XMP SDK 4.1.1 and release under a BSD-style license like Adobe's. The 3 clause BSD (aka New-BSD) license is compatible with GPL.

The API is C based and means to be used from any language and be easier to maintain ABI stability.

• Funcionalidad: no verificada
• Estado: no implementado.

Para páginas HTML se puede usar pyRDFa