Indexable (JPMML model 1.7.2 API)

All Known Subinterfaces:

HasRequiredId<E>, HasRequiredName<E>

All Known Implementing Classes:

DataField, DefineFunction, DerivedField, Field, InstanceField, Item, Itemset, MiningField, OutputField, Parameter, ParameterField, Partition, ResultField, Sequence, SetPredicate, Target, Taxonomy, TextDocument, VectorInstance, VerificationField
```
public interface Indexable<K>
```
A marker interface for PMML elements that specify a primary key-like attribute.

In a collection of Indexable elements, all key values, including the null key value, must be unique.

See Also:

HasId

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  K getKey()

- Method Detail
  - getKey
```
K getKey()
```
    Returns:
    
    The value of the primary key-like attribute. Could be null.