Alternatives
As a rule-based validation language, Schematron may be considered as an alternative to OCL. However Schematron works for Extensible Markup Language (XML) trees while OCL makes it possible to navigate MOF-based models and meta-models (i.e. XML Metadata Interchange (XMI) trees). In other words, OCL has a similar relation to UML or MOF as Schematron has to XML. (Note that Schematron uses XPath to navigate inside the XML trees.)
As a model specification language permitting designers to decorate a model or a meta-model with side-effect-free annotations, OCL could be replaced by languages like Alloy.
Read more about this topic: Object Constraint Language
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