1. A computer implemented method comprising: receiving a selection of an original content item; deriving a supplemental content item from the original content item; designating a unique identifier to the supplemental content item; inserting a reference including the unique identifier into a primary document; deriving an annotated supplemental content item from the supplemental content item; inserting another reference including a unique identifier of the annotated supplemental content item into the primary document, wherein the annotated supplemental content item includes at least one annotation and a subset of content from the supplemental content item; designating the another unique identifier for the annotated supplemental content item; and assembling the primary document, the supplemental content item and the annotated supplemental content item into a structured electronic document.
1. A computer implemented method comprising: receiving a selection of an original content item; deriving a supplemental content item from the original content item; designating a unique identifier to the supplemental content item; inserting a reference including the unique identifier into a primary document; deriving an annotated supplemental content item from the supplemental content item; inserting another reference including a unique identifier of the annotated supplemental content item into the primary document, wherein the annotated supplemental content item includes at least one annotation and a subset of content from the supplemental content item; designating the another unique identifier for the annotated supplemental content item; and assembling the primary document, the supplemental content item and the annotated supplemental content item into a structured electronic document. 6. The method as recited in claim 1 , wherein creating the supplemental document comprises copying the selected candidate content item to a specified location.