The EBNF grammar for the Validation and Transformation Language 2.0

The Validation and Transformation Language (VTL) is a language for expressing validation and transformation rules applicable to statistical data. The version 2.0 of the language has been published in April 2018 and now the EBNF grammar of VTL 2.0 has been published. The EBNF grammar is a formal description of the VTL syntax and can be used for developing IT tools like a syntax checker or an interpreter/compiler. A new version of the Reference Manual has been published. This version contains minor corrections (mainly typos) with respect to the version published in April 2018.