I
English Knowledge Base Category Hierarchy

This appendix provides a list of all the concepts in the knowledge base that serve as categories.

The appendix is divided into six sections, corresponding to the six main branches of the knowledge base:

• Branch 1: science and technology

• Branch 2: business and economics

• Branch 3: government and military

• Branch 4: social environment

• Branch 5: geography

• Branch 6: abstract ideas and concepts

The categories are presented in an inverted-tree hierarchy and within each category, sub-categories are listed in alphabetical order.

Note: This appendix does not contain all the concepts found in the knowledge base. It only contains those concepts that serve as categories (meaning they are parent nodes in the hierarchy).