1. A method, in a data processing system comprising a processor and a memory, for performing an analysis of content based on a flow of property between entities, comprising: performing, by the data processing system, analysis of a corpus of unstructured electronic documents to identify one or more asset transfer flow relationships between entities in unstructured natural language content of the unstructured electronic documents, wherein asset flow relationships indicate a flow of an asset from a first entity to at least one second entity and a type of flow of the asset from the first entity to the at least one second entity; generating, by the data processing system, an asset transfer flow model defining a flow of an asset between entities based on the one or more asset transfer flow relationships between entities; inputting, by the data processing system, the asset transfer flow model into an analysis engine of the electronic content analysis system to configure the analysis engine to use the asset transfer flow model to analyze electronic content; analyzing, by the data processing system, the electronic content using the analysis engine configured with the asset transfer flow model to generate results of the analysis based on the one or more asset transfer flow relationships between entities represented in the asset transfer flow model; and outputting, by the analysis engine, the results of the analysis based on the asset transfer flow model.