The top-level element of the drools-engine.xml configuration
file.
This is the name as it is defined in the rules file
This is the type that is defined in the rules file.
If a value is given then a propertyEditor for this type
is used to convert the string value to a value of the type
defined here and the result is set a the global in the rules
file. If a value is not given the the 'ref' must be specified
and the app context associated with this ruleSet is used to
look up the bean using the ref attribute and it must be of the
type specified in type.