GENERATING AN EXTENSIBLE SCHEMA AND NONEXTENSIBLE BY CREATING AN RNC AND AN RNG FILE FROM A RECEIVED NONEXTENSIBLE SCHEMA

A first nonextensible schema is obtained, based on the first nonextensible schema, a compact syntax regular language for XML next generation (RNC) file. A regular language for XML next generation (RNG) file can be generated based on the RNC file. Based on the RNG file, a second (core) nonextensible schema and a first (core) extensible schema can be generated. An extensible (extension) schema and a nonextensible (extension) schema can also be generated. The extensible (extension) schema and the nonextensible (extension) schema can be plugged into the RNG file. The RNG file can be regenerated with the plugins, and a third nonextensible schema and a second extensible schema can be generated based on the regenerated RNG file. Related apparatus, systems, techniques and articles are also described.