CAMEL provides a comprehensive documentation for both its initial as well as its current version.
For version 1.1, you can consult the CAMEL Documentation, explicating how to use the language, as well as the CAMEL Semantics document, explaining the semantics of all language elements.
For latest version 2.5, there is a confluence page here which covers the specification of the most important domains/aspects akin to user modelling, including snippets conforming to CAMEL’s textual language. In the same page, you can also find CAMEL FAQ which supplies answers related to some core questions related to CAMEL as well as a sub-page which includes the most important CAMEL-related links. A complete language reference can be found here while an analysis of all concrete CAMEL classes along with their respective textual syntax is supplied here.