Domain-Specific Languages ​​(DSLs): Has anyone already developed them for their own specific needs?

Question

Programming languages

How many people realize that Domain Specific Language (DSL) can improve their productivity in development?
Someone already had experience in creating a DSL for their needs? Is the description of this DSL in the public domain?
Examples of commonly used DSLs: SQL, XML, HTML, CSS, etc.
In this question we are talking about self-made DSL.
PS For those who are not familiar with DSL: en.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D0%B4%D0%...

Answer 1

I do this daily. When you write functions/methods like get_all_user_ids or get_user_by_id - that's actually the DSL for your particular domain too. See also tynts .

Answer 2

I recommend looking at irony.codeplex.com
usage examples There are examples somewhere for internal search queries, descriptions of game scenes, etc. if I find it, I'll add it here...
An example of an internal DSL is in the presentation on slide 44