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 * This interface represents a document node as defined in the XPath 2.0 data model.
 * It extends NodeInfo, which is used to represent any node. Every document node must
 * be an instance of DocumentInfo.
 * <p>
 * The interface supports two methods in addition to those for NodeInfo: one to find
 * elements given their ID value, and one to locate unparsed entities. In addition,
 * document nodes have an important property that is not true of nodes in general:
 * two distinct Java DocumentInfo objects never represent the same document node.
 * So the Java "==" operator returns the same result as the {@link NodeInfo#isSameNodeInfo}
 * method.
 * <p>
 * This interface is part of the Saxon public API, and as such (from Saxon8.4 onwards)
 * those methods that form part of the stable public API are labelled with a JavaDoc "since" tag
 * to indicate when they were added to the product.
 * @author Michael H. Kay
 * @since 8.4

public interface DocumentInfo extends NodeInfo {

     * Get the element with a given ID, if any
     * @param id the required ID value
     * @return the element with the given ID, or null if there is no such ID
     *     present (or if the parser has not notified attributes as being of
     *     type ID)
     * @since 8.4

    public NodeInfo selectID(String id);

     * Get the unparsed entity with a given name
     * @param name the name of the entity
     * @return if the entity exists, return an array of two Strings, the first
     *      holding the system ID of the entity, the second holding the public
     *      ID if there is one, or null if not. If the entity does not exist,
     *      the method returns null. Applications should be written on the
     *      assumption that this array may be extended in the future to provide
     *      additional information.
     * @since 8.4

    public String[] getUnparsedEntity(String name);


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