10. The system of claim 8 , wherein the document-receiving mechanism is further configured to receive one or more added source documents; and wherein the search-updating mechanism is further configured to update the search results of related documents based on semantic entities extracted from the added source documents.
8. A system for searching related documents, comprising: a processor; a memory; a document-receiving mechanism configured to receive a source document; a related-document searching mechanism configured to search for related documents based on semantic entities extracted from the source document; a search-criteria receiving mechanism configured to receive user-adjusted search criteria from a user, wherein the user-adjusted search criteria include a user-adjusted entity-extraction sensitivity source document, and wherein the user-adjusted entity-extraction sensitivity indicates a number of semantic entities that are to be extracted from the source document; and a search-updating mechanism configured to update search results of related documents based on the user-adjusted search criteria, wherein the user-adjusted search criteria include the number of semantic entities that are extracted from the source document.