Library

The term "Library" in XBMC refers to one of the the built in databases. The following articles are all relevant to the XBMC libray:

Music Library - XBMC collects ID tag information to create the Music Library, and scrape metadata from the internet.
Video Library - XBMC scrapes information from external websites to create the Video Library
The XBMC Database - The Database (SQL databases) is the underlying structure for the Music and Video Libraries.

This disambiguation page lists articles associated with the same title.
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