Exactly, it conveys underlying data model of dynamic languages, or to be specific, of a common subset of their data types. As for data validity, this is comple

Exactly, it conveys underlying data model of dynamic languages, or to be specific, of a common subset of their data types. As for data validity, this is completely separate question. I don't believe that validation should be a part of the language or data format -- my language lets me write 'age = "yellow"', and so should my data format.