1. A client for accessing content comprising: a processor configured to operate an access application, the access application configured to receive a representation of the content, wherein the content is hierarchically-structured and includes at least first and second items having first and second associated types, respectively, and wherein the representation of the content comprises an identity table and at least first and second type tables, the first type table including at least one item of the first associated type and the second type table including at least one item of the second associated type, each item of content being included in the identity table, and included in at least the first and second type tables based upon the type of the item, the identity table including, for at least one item of content, (i) an item type, (ii) a type identification, (iii) a type name, and (iv) an identity identification associated with a unique combination of: (a) the associated type identification of the item and (b) the type name, the identity identification comprising a plurality of identifiers associated with the type name of the at least one item of content, wherein the access application is configured to access at least a portion of the content based upon the representation of the content including at least the identity table and the first and second type tables.