Information Carrier name (entity name); description + "überlieferung" (entity description)
They represent an E84 Entity (Information Carrier) that is linked (here 1 source content - n inform. carrier) to the source content entity of the document (E33 with type "source content") via p128 (is carried by)
this E84 entity is linked to an E55 type Entity (from http://redmine.craws.net/projects/uni/wiki/Basic_Types#Information-Carrier-Types) that can be selected
Time and place of production: If necessary an invisible production event will be created and linked to the E84 entity. This production event can again be linked to time primitives (via oa5 and oa6) and to a place/location of a physical thing-combination.