What is YAQL ============ YAQL is a general purpose query language, that is designed to operate on objects of arbitrary complexity. YAQL has a large standard library of functions for filtering, grouping and aggregation of data. At the same time YAQL allows you to extend it by defining your own functions. Why YAQL? ========= So why bother and create another solution for a task, that has been addressed by many before us? Obviously because we were not satisfied with flexibility and/or quality of any existing solution. Most notably we needed a tool for json data, that would support some complex data transformations. YAQL is a pure-python library and therefore is easily embeddable in any python application. YAQL is designed to be human-readable and has a SQL-like feel and look. It is inspired in part by LINQ for .NET. Since YAQL is extensible and embeddable it makes a perfect choice for becoming the basis for your DSLs.