/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2011, Open Source Geospatial Foundation (OSGeo)
* (C) 2005 Open Geospatial Consortium Inc.
*
* All Rights Reserved. http://www.opengis.org/legal/
*/
package org.opengis.filter.expression;
// Annotations
import org.opengis.annotation.XmlElement;
import org.xml.sax.helpers.NamespaceSupport;
/**
* Expression class whose value is computed by retrieving the value indicated
* by the provided name.
* <p>
* The most common applicatoin of this is to retrive
* a {@linkplain org.opengis.feature.Feature feature}'s property using
* an xpath expression.
* </p>
* <p>
* Please note that the Filter specification allows a limited subset of
* XPath to be used for the PropertyName. We encourage implementations to
* match this functionality.
* </p>
*
* @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/filter/expression/PropertyName.java $
* @version <A HREF="http://www.opengis.org/docs/02-059.pdf">Implementation specification 1.0</A>
* @author Chris Dillard (SYS Technologies)
* @since GeoAPI 2.0
*/
@XmlElement("PropertyName")
public interface PropertyName extends Expression {
/**
* Returns the name of the property whose value will be returned by the
* {@link #evaluate evaluate} method.
*/
String getPropertyName();
/**
* Returns namespace context information, or null if unavailable/inapplicable
*
* @return namespace context information, or null if unavailable/inapplicable
*/
NamespaceSupport getNamespaceContext();
}