An S4 class to represent a ml.col.def.
.expr
A string with expresion that define the ml.col.def
.parent
Pointer to the ml.data.frame-class object that the field belongs to
.type
A string with the type of field
.name
A string with name of the field
.data_type
A string with the data type of the field
.org_name
A string with the original names of field
.org_xpath
A string with the xpath of field
.format
A string with the format of the source field
.xmlns
A string with the namespace of the source field
.aggType
A string
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