Unique field
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This module performs additional validation when a node is created or updated by a user to require that a node's title, author, language, and CCK fields are unique within a given context.
Without this module, Drupal and CCK do not prevent multiple nodes from having the same title or the same value in a certain field.
For example, if you have a content type with a date field and there should only be one node per date, you could use this module to prevent a node from being saved with a date already used in another node.
