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@@ -293,8 +293,10 @@ Information about categories holds \ref line_cats data structure.
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\section vlibAttributes Attributes
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-The old GRASS 4.x 'dig_cats' files are not used any more and vectors'
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-attributes are stored in external database. Connection with the
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+For a user-centric view about attribute management, see the explanations
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+in the <a href="http://grasswiki.osgeo.org/wiki/Vector_Database_Management">GRASS GIS Wiki</a>.
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+
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+The attribute data are stored in external database. Connection with the
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database is done through drivers based on \ref dbmilib. Records in a
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table are linked to vector entities by layer and category number. The
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layer identifies table and the category identifies record. I.e., for
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@@ -313,6 +315,8 @@ driver+database+table+row
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The general DBMI settings are defined in the '$MAPSET/VAR' text file
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(maintained with <tt>db.connect</tt> command at user level).
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+Note: vector boundaries are (typically) handled without category since adjacent
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+parcels might have two different categories which prevents from a unique assignment.
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\section vlibGeometry Vector library feature geometry
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Markus Neteler