The content repository itself is intended only as a common substrate for developing content-driven applications. It provides the developer with a core set of content-related services:

Defining arbitrary content types. 
Common storage of content items (each item consists of a text or binary data with additional attributes as specified by the content type). 
Establishing relationships among items of any type. 
Versioning 
Consistent interaction with other services included in the ACS core, including permissions, workflow and object relationships. 
Categorization 
Searching