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## org.apache.xerces.impl.xs.models
Interface XSCMValidator

All Known Implementing Classes:
  XSDFACM, XSAllCM, XSEmptyCM

public interface XSCMValidator

Note: State of the content model is stored in the validator

Version:
  $Id: XSCMValidator.java,v 1.5 2003/03/11 15:48:33 sandygao Exp $
Author:
  Sandy Gao, IBM, Elena Litani, IBM

Field Summary
`static short` | `FIRST_ERROR`
`static short` | `SUBSEQUENT_ERROR`

Method Summary
`boolean` | `checkUniqueParticleAttribution(SubstitutionGroupHandler subGroupHandler)` check whether this content violates UPA constraint.
`boolean` | `endContentModel(int[] state)` The method indicates the end of list of children
`java.lang.Object` | `oneTransition(org.apache.xerces.xni.QName elementName, int[] state, SubstitutionGroupHandler subGroupHandler)` The method corresponds to one transaction in the content model.
`int[]` | `startContentModel()` This methods to be called on entering a first element whose type has this content model.
`java.util.Vector` | `whatCanGoHere(int[] state)` Check which elements are valid to appear at this point.

Field Detail

### FIRST_ERROR

    public static final short FIRST_ERROR

### SUBSEQUENT_ERROR

    public static final short SUBSEQUENT_ERROR

Method Detail

### startContentModel

    public int[] startContentModel()

  This methods to be called on entering a first element whose type has this content model. It will return the initial state of the content model
  Returns:
    Start state of the content model

### oneTransition

    public java.lang.Object oneTransition(org.apache.xerces.xni.QName elementName,
                                          int[] state,
                                          SubstitutionGroupHandler subGroupHandler)

  The method corresponds to one transaction in the content model.
  Parameters:
    `elementName` -
    `state` - Current state
  Returns:
    element decl or wildcard decl that corresponds to the element from the Schema grammar

### endContentModel

    public boolean endContentModel(int[] state)

  The method indicates the end of list of children
  Parameters:
    `state` - Current state of the content model
  Returns:
    true if the last state was a valid final state

### checkUniqueParticleAttribution

    public boolean checkUniqueParticleAttribution(SubstitutionGroupHandler subGroupHandler)
                                           throws XMLSchemaException

  check whether this content violates UPA constraint.
  Parameters:
    `errors` - to hold the UPA errors
  Returns:
    true if this content model contains other or list wildcard

### whatCanGoHere

    public java.util.Vector whatCanGoHere(int[] state)

  Check which elements are valid to appear at this point. This method also works if the state is in error, in which case it returns what should have been seen.
  Parameters:
    `state` - the current state
  Returns:
    a Vector whose entries are instances of either XSWildcardDecl or XSElementDecl.

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