Efficient XML Interchange (EXI) Primer

This is a non-normative document intended to provide an easily readable technical background on the Efficient XML Interchange (EXI) format. It is oriented towards quickly understanding how the EXI format can be used in practice and how options can be set to achieve specific needs. Section 2. Concepts describes the structure and content of an EXI document and introduces the notions of EXI header, EXI body, and EXI grammar which are fundamental to the understanding of the EXI format. Furthermore, additional details about data type representation, compression, and their interaction with other format features are presented. Finally, Section 3. Efficient XML Interchange by Example provides a detailed, bit-level description of both, a schema-less and a schema-informed example.