SType

All Known Subinterfaces:

SDataType, SEnumeration, SPrimitiveDataType
```
public interface SType
```
Types define categories of values. For each type we can say that does a particular value belong to it by isInstanceOf(Object). Note that null is treated as a possible value so it can be an instance of some types.

Field Summary

Fields
Modifier and Type Field Description

static Object NOT_A_VALUE
Object that can not be an instance of any type.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Object`	`getDefault()`	Returns default value of the type.
`boolean`	`isInstanceOf(Object value)`	Returns `true` if given values belongs to this type.

- Field Detail
  - NOT_A_VALUE
```
@NotNull
static final Object NOT_A_VALUE
```
    Object that can not be an instance of any type. We use such marker object to show that we can not return any value of a particular type. We can not use null for such purpose since null can be actually a value of some types.
- Method Detail
  - isInstanceOf
```
boolean isInstanceOf(@Nullable
                     Object value)
```
    Returns true if given values belongs to this type. Note that null can be an instance of some types.
  - getDefault
```
@Nullable
Object getDefault()
```
    Returns default value of the type.