Javadoc
A model that when invoked with a 'path' parameter will perform a servlet
include. It also support an optional hash named 'params' which specifies
request parameters for the include - its keys are strings, its values
should be either strings or sequences of strings (for multiple valued
parameters). A third optional parameter 'inherit_params' should be a boolean
when specified, and it defaults to true when not specified. A value of true
means that the include inherits the request parameters from the current
request. In this case values in 'params' will get prepended to the existing
values of parameters.