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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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// Attributes.java - attribute list with Namespace support
// http://www.saxproject.org
// Written by David Megginson
// NO WARRANTY!  This class is in the public domain.
// $Id: Attributes.java 226184 2005-04-08 10:53:24Z neeraj $

package org.xml.sax;


/**
 * Interface for a list of XML attributes.
 *
 * 
 * This module, both source code and documentation, is in the
 * Public Domain, and comes with NO WARRANTY.
 * See http://www.saxproject.org
 * for further information.
 * 
 *
 * This interface allows access to a list of attributes in
 * three different ways:
 *
 * 
 * by attribute index;
 * by Namespace-qualified name; or
 * by qualified (prefixed) name.
 * 
 *
 * The list will not contain attributes that were declared
 * #IMPLIED but not specified in the start tag.  It will also not
 * contain attributes used as Namespace declarations (xmlns*) unless
 * the http://xml.org/sax/features/namespace-prefixes 
 * feature is set to true (it is false by 
 * default).
 * Because SAX2 conforms to the original "Namespaces in XML"
 * recommendation, it normally does not
 * give namespace declaration attributes a namespace URI.
 * 
 *
 * Some SAX2 parsers may support using an optional feature flag
 * (http://xml.org/sax/features/xmlns-uris) to request
 * that those attributes be given URIs, conforming to a later
 * backwards-incompatible revision of that recommendation.  (The
 * attribute's "local name" will be the prefix, or "xmlns" when
 * defining a default element namespace.)  For portability, handler
 * code should always resolve that conflict, rather than requiring
 * parsers that can change the setting of that feature flag.  
 *
 * If the namespace-prefixes feature (see above) is
 * false, access by qualified name may not be available; if
 * the http://xml.org/sax/features/namespaces feature is
 * false, access by Namespace-qualified names may not be
 * available.
 *
 * This interface replaces the now-deprecated SAX1 {@link
 * org.xml.sax.AttributeList AttributeList} interface, which does not 
 * contain Namespace support.  In addition to Namespace support, it 
 * adds the getIndex methods (below).
 *
 * The order of attributes in the list is unspecified, and will
 * vary from implementation to implementation.
 *
 * @since SAX 2.0
 * @author David Megginson
 * @version 2.0.1 (sax2r2)
 * @see org.xml.sax.helpers.AttributesImpl
 * @see org.xml.sax.ext.DeclHandler#attributeDecl
 */
public interface Attributes
{


    ////////////////////////////////////////////////////////////////////
    // Indexed access.
    ////////////////////////////////////////////////////////////////////


    /**
     * Return the number of attributes in the list.
     *
     * Once you know the number of attributes, you can iterate
     * through the list.
     *
     * @return The number of attributes in the list.
     * @see #getURI(int)
     * @see #getLocalName(int)
     * @see #getQName(int)
     * @see #getType(int)
     * @see #getValue(int)
     */
    public abstract int getLength ();


    /**
     * Look up an attribute's Namespace URI by index.
     *
     * @param index The attribute index (zero-based).
     * @return The Namespace URI, or the empty string if none
     *         is available, or null if the index is out of
     *         range.
     * @see #getLength
     */
    public abstract String getURI (int index);


    /**
     * Look up an attribute's local name by index.
     *
     * @param index The attribute index (zero-based).
     * @return The local name, or the empty string if Namespace
     *         processing is not being performed, or null
     *         if the index is out of range.
     * @see #getLength
     */
    public abstract String getLocalName (int index);


    /**
     * Look up an attribute's XML qualified (prefixed) name by index.
     *
     * @param index The attribute index (zero-based).
     * @return The XML qualified name, or the empty string
     *         if none is available, or null if the index
     *         is out of range.
     * @see #getLength
     */
    public abstract String getQName (int index);


    /**
     * Look up an attribute's type by index.
     *
     * The attribute type is one of the strings "CDATA", "ID",
     * "IDREF", "IDREFS", "NMTOKEN", "NMTOKENS", "ENTITY", "ENTITIES",
     * or "NOTATION" (always in upper case).
     *
     * If the parser has not read a declaration for the attribute,
     * or if the parser does not report attribute types, then it must
     * return the value "CDATA" as stated in the XML 1.0 Recommendation
     * (clause 3.3.3, "Attribute-Value Normalization").
     *
     * For an enumerated attribute that is not a notation, the
     * parser will report the type as "NMTOKEN".
     *
     * @param index The attribute index (zero-based).
     * @return The attribute's type as a string, or null if the
     *         index is out of range.
     * @see #getLength
     */
    public abstract String getType (int index);


    /**
     * Look up an attribute's value by index.
     *
     * If the attribute value is a list of tokens (IDREFS,
     * ENTITIES, or NMTOKENS), the tokens will be concatenated
     * into a single string with each token separated by a
     * single space.
     *
     * @param index The attribute index (zero-based).
     * @return The attribute's value as a string, or null if the
     *         index is out of range.
     * @see #getLength
     */
    public abstract String getValue (int index);



    ////////////////////////////////////////////////////////////////////
    // Name-based query.
    ////////////////////////////////////////////////////////////////////


    /**
     * Look up the index of an attribute by Namespace name.
     *
     * @param uri The Namespace URI, or the empty string if
     *        the name has no Namespace URI.
     * @param localName The attribute's local name.
     * @return The index of the attribute, or -1 if it does not
     *         appear in the list.
     */
    public int getIndex (String uri, String localName);


    /**
     * Look up the index of an attribute by XML qualified (prefixed) name.
     *
     * @param qName The qualified (prefixed) name.
     * @return The index of the attribute, or -1 if it does not
     *         appear in the list.
     */
    public int getIndex (String qName);


    /**
     * Look up an attribute's type by Namespace name.
     *
     * See {@link #getType(int) getType(int)} for a description
     * of the possible types.
     *
     * @param uri The Namespace URI, or the empty String if the
     *        name has no Namespace URI.
     * @param localName The local name of the attribute.
     * @return The attribute type as a string, or null if the
     *         attribute is not in the list or if Namespace
     *         processing is not being performed.
     */
    public abstract String getType (String uri, String localName);


    /**
     * Look up an attribute's type by XML qualified (prefixed) name.
     *
     * See {@link #getType(int) getType(int)} for a description
     * of the possible types.
     *
     * @param qName The XML qualified name.
     * @return The attribute type as a string, or null if the
     *         attribute is not in the list or if qualified names
     *         are not available.
     */
    public abstract String getType (String qName);


    /**
     * Look up an attribute's value by Namespace name.
     *
     * See {@link #getValue(int) getValue(int)} for a description
     * of the possible values.
     *
     * @param uri The Namespace URI, or the empty String if the
     *        name has no Namespace URI.
     * @param localName The local name of the attribute.
     * @return The attribute value as a string, or null if the
     *         attribute is not in the list.
     */
    public abstract String getValue (String uri, String localName);


    /**
     * Look up an attribute's value by XML qualified (prefixed) name.
     *
     * See {@link #getValue(int) getValue(int)} for a description
     * of the possible values.
     *
     * @param qName The XML qualified name.
     * @return The attribute value as a string, or null if the
     *         attribute is not in the list or if qualified names
     *         are not available.
     */
    public abstract String getValue (String qName);

}

// end of Attributes.java