In connection with a machine-based system for transforming data from a source form to a target form, a tool is provided for sharing information established in developing a transformation model. The shared information may relate to rules for mapping source collection terms to standardized terms, rules for ordering or syntax, rules for classifying terms or other transformation rules. Such information defines a knowledge base for the project. The knowledge base is divided into domains and subdomains that define a hierarchy that includes dependencies and references. These dependencies and references are used for domain management such that any conflicts and inconsistencies can be identified and arbitrated. In this manner, information sharing is accommodated, for example, for efficient knowledge base creation and multi-user functionality.