7. A computer system for generating an appendix from document content comprising: one or more processors, one or more computer-readable storage devices, and a plurality of program instructions stored on at least one of the one or more storage devices for execution by at least one of the one or more processors, the plurality of program instructions comprising: a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: executing a zoning and structural analysis phase, wherein the zoning and structural analysis phase comprises identifying a document structure, and storing the identified document structure; in response to completing the zoning and structural analysis phase, executing a semantic relationship extraction phase, wherein the semantic relationship extraction phase comprises extracting semantic relationships from the stored identified document structure, and storing the extracted semantic relationships, and wherein the semantic relationship extraction phase further comprises: extracting a semantic relationship from each stored identified sentence, wherein the semantic relationship comprises a subject, a predicate, and an object; responsive to extracting and identifying the semantic relationship, applying statistical distribution analysis to record a position where the subject and the object appear in the document; identifying and eliminating a trivial relation, wherein the trivial relation does not relate to a main topic of the document and based on the trivial relation having at least one of: the subject being evenly distributed within a section of the document, wherein a section is selected from a group consisting of a sentence, a paragraph, a page, a chapter, and the document as a whole the document; and the object being evenly distributed within the section of the document; and storing a non-trivial relation in persistent storage; in response to completing the semantic relationship extraction phase, executing an analytics and relevance determination phase wherein the analytics and relevance determination phase comprises identifying candidate appendix topics in the stored extracted semantic relationships based on a degree of interdependency between the semantic relationships and storing the identified candidate appendix topics; in response to completing the analytics and relevance determination phase, executing a web mining phase wherein the web mining phase comprises calculating a measure of relevance of the mined web page to the stored candidate appendix topics and eliminating non-relevant intermediate results; and based on the web mining phase returning results relevant to a topic of the document, program instructions to generate the appendix.
10. The computer system of claim 7 , wherein the web mining phase further comprises: iteratively: mining digital content for information corresponding to the stored candidate appendix topic; applying textual analysis to the mined digital content to calculate a measure of relevance to the candidate appendix topic; analyzing the mined digital content to identify at least one relevant result from the mined digital content; storing statistically relevant mined digital content as an intermediate result in persistent storage; and applying at least one heuristic to stored statistically relevant result to identify a final appendix topic candidate.