An external module in the Archiving and Interchange DTD Suite that is first set up in the Module to Name the Modules (%modules.ent;) and is then called from a DTD to set up the namespsaces and Parameter Entities for the MathML elements. This module then calls the MathML DTD to include the MathML elements in the tag set.
<!ENTITY % mathmlsetup.ent PUBLIC "-//NLM//DTD Archiving and Interchange DTD Suite MathML Setup Module v1.0 20021201//EN" "mathmlsetup.ent" >
modules.ent