1. A document generation system including a hardware processor and memory storing instructions for generating a customized document comprising: instructions for reading a usage tag from a first file which is a clause file used for a plurality of master documents; instructions for utilizing the usage tag to identify a first usage statement in a second file, where the first usage statement associates the usage tag with first document content for a first one of the master documents, and wherein a third file includes a second usage statement which associates the usage tag with second document content for a second one of the master documents; instructions for obtaining input information to evaluate the first usage statement; and generating the customized document based on the first one of the master documents; whereby different variations of document content for use with different master documents are associated with a single usage tag in the clause file.
1. A document generation system including a hardware processor and memory storing instructions for generating a customized document comprising: instructions for reading a usage tag from a first file which is a clause file used for a plurality of master documents; instructions for utilizing the usage tag to identify a first usage statement in a second file, where the first usage statement associates the usage tag with first document content for a first one of the master documents, and wherein a third file includes a second usage statement which associates the usage tag with second document content for a second one of the master documents; instructions for obtaining input information to evaluate the first usage statement; and generating the customized document based on the first one of the master documents; whereby different variations of document content for use with different master documents are associated with a single usage tag in the clause file. 13. The system of claim 1 in which the master document comprises information describing the attributes of one or more variables.