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package com.sun.org.apache.xerces.internal.xni.parser;

import java.io.IOException;
import com.sun.org.apache.xerces.internal.xni.XNIException;

/**
 * This interface defines a generic DTD scanner. This interface
 * allows a scanner to be used interchangably in existing parser
 * configurations.
 * 
 * If the parser configuration uses a DTD scanner that implements
 * this interface, components should be able to query the scanner
 * instance from the component manager using the following property 
 * identifier:
 * 

 *  "http://apache.org/xml/properties/internal/dtd-scanner"
 * 
 *
 * @author Andy Clark, IBM
 *
 * @version $Id: XMLDTDScanner.java,v 1.6 2010-11-01 04:40:22 joehw Exp $
 */
public interface XMLDTDScanner 
    extends XMLDTDSource, XMLDTDContentModelSource {

    //
    // XMLDTDScanner methods
    //

    /** 
     * Sets the input source. 
     *
     * @param inputSource The input source or null.
     *
     * @throws IOException Thrown on i/o error.
     */
    public void setInputSource(XMLInputSource inputSource) throws IOException;

    /** 
     * Scans the internal subset of the document.
     *
     * @param complete True if the scanner should scan the document
     *                 completely, pushing all events to the registered
     *                 document handler. A value of false indicates that
     *                 that the scanner should only scan the next portion
     *                 of the document and return. A scanner instance is
     *                 permitted to completely scan a document if it does
     *                 not support this "pull" scanning model.
     * @param standalone True if the document was specified as standalone.
     *                   This value is important for verifying certain
     *                   well-formedness constraints.
     * @param hasExternalSubset True if the document has an external DTD.
     *                          This allows the scanner to properly notify
     *                          the handler of the end of the DTD in the
     *                          absence of an external subset.
     *
     * @return True if there is more to scan, false otherwise.
     */
    public boolean scanDTDInternalSubset(boolean complete, boolean standalone,
                                         boolean hasExternalSubset)
        throws IOException, XNIException;

    /**
     * Scans the external subset of the document.
     *
     * @param complete True if the scanner should scan the document
     *                 completely, pushing all events to the registered
     *                 document handler. A value of false indicates that
     *                 that the scanner should only scan the next portion
     *                 of the document and return. A scanner instance is
     *                 permitted to completely scan a document if it does
     *                 not support this "pull" scanning model.
     *
     * @return True if there is more to scan, false otherwise.
     */
    public boolean scanDTDExternalSubset(boolean complete) 
        throws IOException, XNIException;

} // interface XMLDTDScanner