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## Changes in YQL versions
This section contains a list of changes in different versions of the YQL
## General description of YQL versions
The goal of language versioning is a controlled and user-safe evolution of the language, within which it is possible to:
* add new features;
* change default values for pragmas or perform other non-backward-compatible changes;
* remove obsolete features.
The starting version of the language is `2025.01`.
Once a year, a new version of the language is released, called `YEAR.X`, for example `2025.01`. Other versions in the same year will increase the minor version number (`YEAR.02`, etc.).
For each version of the type `YEAR.X` **support is guaranteed for three years with the preservation of semantics and bug fixes**.
When version `YEAR+2.1` is released, a warning is issued for all versions of the type `YEAR.X` that they will soon cease to be supported.
When version `YEAR+3.1` is released, a warning is issued for all versions of the type `YEAR.X` that they are not supported and query execution is not guaranteed.
When specifying a version of `YEAR.X` greater than what is currently available in some service/library/tool, a query error is issued.
When each version is released, the documentation in the changelog indicates the changes included in this version and recommendations for migration.
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