15. A system that executes document processing, the system comprising: a processor; a memory communicatively coupled to the processor, the memory having stored therein computer-executable instructions that when executed by the processor, cause the processor to perform: modeling a domain with a plurality of domain models; determining a presence of a keyword in a document that matches a keyword appearing in a pre-set vocabulary list; searching the document for additional keywords related to the matching keyword to determine a context for the matching keyword; representing the document as a collection of at least one domain model, the domain model selected based at least on the matching keyword and the additional related keywords and having properties relating to the matching keyword; populating the properties of the at least one domain model with values corresponding to properties of the document being represented; and populating at least one domain model property with a disparate domain model as a value of the domain model property.
15. A system that executes document processing, the system comprising: a processor; a memory communicatively coupled to the processor, the memory having stored therein computer-executable instructions that when executed by the processor, cause the processor to perform: modeling a domain with a plurality of domain models; determining a presence of a keyword in a document that matches a keyword appearing in a pre-set vocabulary list; searching the document for additional keywords related to the matching keyword to determine a context for the matching keyword; representing the document as a collection of at least one domain model, the domain model selected based at least on the matching keyword and the additional related keywords and having properties relating to the matching keyword; populating the properties of the at least one domain model with values corresponding to properties of the document being represented; and populating at least one domain model property with a disparate domain model as a value of the domain model property. 16. The system of claim 15 , wherein the memory includes stored therein, computer-executable instructions that, when executed by the processor, cause the processor to perform: searching across the plurality of domain models in connection with calculating statistics associated with a set of documents.