Extensible ML (EML) is an ML-like programming language that adds support for object-oriented idioms in a functional setting. EML extends ML-style datatypes and functions with a class construct designed to be extended into hierarchies, thus allowing the programmer to seamlessly integrate the object-oriented programming paradigm with the traditional functional style.
Extensible ML is related neither to the programming language Extended ML (other than being similarly derived from ML), nor to the specification language eXtensible Markup Language, nor to extensible programming.
References
Extensible ML Wikipedia(Text) CC BY-SA