where i can learn WSO2 ESB expressions

Question

I am doing some POC using WSO2 ESB and other stack. I have seen different expression for property files in some examples scenario. i.e. expression="get-property('registry','conf:/test.xml')" expression="$ctx:customerID"

can anyone tell me where i can find all these expression syntax.

Answer 1

Expressions are about retrieving the value. These will be useful, http://rajikak.blogspot.com/2010/04/xpath-functions-and-properties-avilable.html http://docs.wso2.org/display/ESB470/Mediators

The second points to official documentation of WSO2 ESB where each mediator is explained in detail.

Answer 2

Below link explain all the expression we need to access the message passing through the ESB. http://docs.wso2.org/display/ESB470/Properties+Reference