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PMML 1.1 -- Mining Schema

Each model contains one mining schema which lists fields as used in that model. This is a subset of the fields as defined in the data dictionary. While the mining schema contains information that is specific to a certain model, the data dictionary contains data definitions which do not vary per model.

<!ELEMENT MiningSchema (Extension*, MiningField+) >

<!ENTITY  % FIELD-USAGE-TYPE "(active | 
                               predicted | 
                               supplementary)" >

<!ENTITY  % OUTLIER-TREATMENT-METHOD "( asIs |
                                        asMissingValues |
                                        asExtremeValues ) " >

usageType
active: field used as input (independent field)
predicted: field whose value is predicted by the model
supplementary: field holding additional descriptive information

Supplementary fields are not required to apply a model. They are provided as additional information for explanatory purpose, though. When some field has gone through preprocessing transformations before a model is built, then an additional supplementary field is typically used to describe the statistics for the original field values.

outliers
asIs: field values treated at face value
asMissingValues: outlier values are treated as if they were missing
asExtremeValues: outlier values are changed to a specific high or low value defined in MiningField

<!ELEMENT MiningField (Extension*) > <!ATTLIST MiningField name %FIELD-NAME; #REQUIRED usageType %FIELD-USAGE-TYPE; "active" outliers %OUTLIER-TREATMENT-METHOD; "asIs" lowValue %NUMBER; #IMPLIED highValue %NUMBER; #IMPLIED >

name: symbolic name of field, same as the name of some field in the data dictionary
highValue and lowValue: used in conjunction with %outlierTreatmentMethod "asExtremeValues" as values for records with outliers in this field if x < lowValue then x = lowValue

Conformance

outlier treatment 'asIs', i.e. the default value of the attribute outliers in MiningField, is in core; other options are not in core.

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