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/*
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 * and Distribution License("CDDL") (collectively, the "License").  You
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package com.sun.xml.xsom;

import com.sun.xml.xsom.visitor.XSTermFunction;
import com.sun.xml.xsom.visitor.XSTermVisitor;
import com.sun.xml.xsom.visitor.XSTermFunctionWithParam;

/**
 * A component that can be referenced from {@link XSParticle}
 * 
 * This interface provides a set of type check functions (isXXX),
 * which are essentially:
 * 
 *  * boolean isXXX() {
 *     return this instanceof XXX;
 * }
 *  * 
 * and a set of cast functions (asXXX), which are
 * essentially:
 * 
 *  * XXX asXXX() {
 *     if(isXXX())  return (XXX)this;
 *     else          return null;
 * }
 * 
 */
public interface XSTerm extends XSComponent
{
    void visit( XSTermVisitor visitor );
     T apply( XSTermFunction function );
     T apply( XSTermFunctionWithParam function, P param );

    // cast functions
    boolean isWildcard();
    boolean isModelGroupDecl();
    boolean isModelGroup();
    boolean isElementDecl();

    XSWildcard asWildcard();
    XSModelGroupDecl asModelGroupDecl();
    XSModelGroup asModelGroup();
    XSElementDecl asElementDecl();
}