It's a long established tradition in computing to write the compiler for language L in L. That's not the same, of course, as writing the specification in L.
Of course, the XML schema for XSD documents does not fully specify XSD. It only specifies the syntax; and even then, only partially.
Michael Kay
Saxonica
+44 (0) 118 946 5893
On 10 Jan 2015, at 20:43, Costello, Roger L. <> wrote:
> Hi Folks,
>
> I think it is mind-blowing when a language is defined using the language itself.
>
> This document defines the XML Schema language using XML Schema:
>
> http://www.w3.org/TR/xmlschema11-1/#normative-schemaSchema
>
> That is the XML schema-for-schemas!
>
> This document defines the JSON Schema language using JSON Schema:
>
> http://json-schema.org/draft-04/schema#
>
> That is the JSON schema-for-schemas!
>
> These two documents define the ANTLR grammar language using the ANTLR grammar:
>
> https://github.com/antlr/grammars-v4/blob/master/antlr4/ANTLRv4Parser.g4
> https://github.com/antlr/grammars-v4/blob/master/antlr4/ANTLRv4Lexer.g4
>
> That is the ANTLR grammar-for-grammars!
>
> Neat!
>
> Do you know of other languages that are defined using the language itself?
>
> /Roger
>
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