5. An associative memory system according to claim 4 wherein the observer system comprises: an entity observer that is configured to observe into the network of entity associative memory networks, the associations among a respective observer entity and a plurality of observed entities that are observed by the respective observer entity, based on the plurality of input documents; and a document observer that is configured to observe into the network of document associative memory networks, the associations among observed entities in a respective observer input document.
5. An associative memory system according to claim 4 wherein the observer system comprises: an entity observer that is configured to observe into the network of entity associative memory networks, the associations among a respective observer entity and a plurality of observed entities that are observed by the respective observer entity, based on the plurality of input documents; and a document observer that is configured to observe into the network of document associative memory networks, the associations among observed entities in a respective observer input document. 9. An associative memory system according to claim 5 wherein the processing system further comprises: a reader system that is responsive to the input documents and is configured to produce document IDs and document data therefrom; a parser that is responsive to the document data and is configured to extract entities from the document data; and a context generator that is responsive to the parser and is configured to identify observer entities and observed entities from the entities that are extracted and to provide the observer entities and observed entities to the entity observer and the document observer.