US Patent 7269787 Multi-document context aware annotation system

A method for document annotation includes providing a contextual framework extending over multiple electronic documents. Annotations are input to a computer by a user with respect to two or more of the documents, while the user views the documents on a computer screen. Each of the annotations is stored together with respective context information in a memory of the computer, the context information including multiple fields defined by the framework. The annotations are sorted with respect to the two or more documents according to one or more of the multiple fields of the respective context information, and the sorted annotations are output for viewing by the user.