TermBase eXchange (TBX), the ISO standard for the representation and interchange of terminological data, is currently undergoing revision and will for the first time formalize overarching structural constraints regarding the definition and validation of dialects and XML styles. To match these requirements, the ODD specification language provides advanced subset selection and constraint specification capabilities covering both structure and content of text encoding formalisms. Following the literate programming methodology, it furthermore allows the definition of integrated resources, which contain formal specifications alongside their prose descriptions and usage examples. This paper first describes the meta-model behind TBX as well as current challenges in the context of its revision. From this follows a description of applicable ODD mechanisms and the design of an ODD architecture, which allows for a complete specification of present-day TBX.