TM4J is a topic map processing toolkit and a set of topic map processing tools. Topic maps are an ISO standard for the interchange of information structures which can be used to represent ontologies, business data and processes, individual knowledge and opinions, and more. The goal of the TM4J project is to develop high-quality, Open Source software for the creation, manipulation, and exchange of topic maps.
TMAPI is a programming interface for accessing and manipulating data held in a topic map. The TMAPI specification defines a set of core interfaces which must be implemented by a compliant application, as well as a set of additional interfaces which may be implemented by a compliant application or which may be built upon the core interfaces. The goal is to define a common programming interface for all topic map processors, enabling portable code and a shorter learning curve for developers moving between topic map processers.