Document libraries that facilitate content contribution to and management
of a website. In general, a document library comprises a database, a
special "document library" file system folder and the documents in that
folder (or within subfolders of that folder). The database maintains
properties of documents in the document library file system folder, and
is used to dynamically update views of the document library file system
folder and views of properties of the documents. Each document folder is
a folder in which content of a specified type may be read and saved.