Properties retrieved from a das catalog node, a wrapper around Object.
DasNodes can have properties of different types. Since Java reflection provides
methods for determining the actual return type of a property pulled from a catalog
node, introducing a property type seems on it's face to be an unnecessary
complication. However to avoid having a completely open ended interface that can
return just any type of object this class exists to put boundaries around the
value types an application program will have to deal with when reading from a das
catalog.
Without this class, constructs like the following would be common in application
code:
String sFragment = "interface/data/efield/units";
Object obj = node.prop(sFragment, Map