The media expansion editor provides a means to record a textual description of the media type in a large-quantity text field, along with information regarding how the media type is used in other functional areas.

The advanded editor drop-down list provides a means to select a specialised Advanced Editor type to be made available to Items of this media type when edited within the Manage Items dialog.

Within the Ptolomy release of Pergamon, three Advanced Editors are currently supported: The written word editor, The moving image editor, and The audio editor.

The loan days field provides a means to specify a default number of days for which any Item of this media type should be circulated. Normally however, a duration is already specified by the Circulations Profile records. If a specific duration is not required for this media type, set the 'Loan Days' field to 0.