These documents describe the rules used by HumMod, and possibly other equation solvers, to define a mathematical model.

Our intent was that the simulation environment would not be associated with proprietary hardware, software and formatting. Extensible Markup Language (XML) was selected as the grammar.

Briefly, XML uses names in angle brackets (`< and >`) to identify data. The brackets and names are called tags. Data lies between two tags. The tag – data – tag sequence is called an element and the data is called the element content.

There are five volumes in this document. The main task of these volumes is to describe all of the XML elements that we have defined for out modeling environment.