Municipal site development regulations heavily influence the layout and design of building sites, but paper based regulations are extremely inefficient for use in computer-aided design. This paper describes the conceptual design for SITE CODE, a knowledge-based model of a municipal site development code which was developed t o study how regulations can be incorporated into systems for computer-aided site design. SITE CODE was developed from studies of site development regulations in Austin, Texas, San Diego, California , and Fairfax County, Virginia in the United States. The primary function of SITE CODE is to extract from the code all design requirements which are applicable to a particular development project. An organizational system for regulations has been developed to facilitate retrieval of design requirements based on: ( 1 ) the geographic district or region in which a regulation is applicable, (2) the time period during which a regulation is effective, and (3) the administrative or legal process (zoning, land subdivision, or site plan review) with which a regulation is associated. SITE CODE consists of a hybrid rule-based/object-oriented representation of site development regulations called the regulatory knowledge base. An object-oriented requirements knowledge base containing project-specific design information extracted from the regulations is created dynamically during a session.

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