Grammar

All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

RELAXGrammar, RELAXModule, RELAXNGGrammar, TREXGrammar, XMLSchemaGrammar
```
public interface Grammar
extends java.io.Serializable
```
base interface of the "grammar". This interface characterizes very basic part of grammar.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ExpressionPool`	`getPool()`	gets ExpressionPool object which was used to construct this grammar.
`Expression`	`getTopLevel()`	gets top-level expression.

- Method Detail
  - getTopLevel
```
Expression getTopLevel()
```
    gets top-level expression. This expression shall be the constraint over the document element. Never return null.
  - getPool
```
ExpressionPool getPool()
```
    gets ExpressionPool object which was used to construct this grammar. Never return null.