From MathWeb

The OWL-DL implementation of the OMDoc document ontology is modular, roughly one OWL-DL file per module (see chapter 22.3 of the OMDoc book) of the OMDoc XML schema.

One-file version

make install creates a one-file version of the ontology and installs it on the OMDoc homepage. The OWLMerge tool (see Makefile.vars.template) is required, and appropriate repository access permissions.

References

• Old, partly obsolete:
  • owl:imports in the OWL reference
  • Tutorial
  • Formal background (I haven't read these papers, just found them. --Clange 14:36, 12 July 2006 (CEST))
    • Paper on modular ontologies
    • Modularization Algorithm