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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2005-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.data;

import java.net.URI;
import java.util.Set;

/**
 * Information about a service.
 *
 * You can treat this bean as a "summary view" on more complete metadata information that may be
 * accessible as header or table information.
 *
 * 
The names used in this class have been taken from Dublin Code and it's application profile for
 * RDF.
 *
 * @author Jody Garnett, Refractions Research
 * @author David Zwiers, Refractions Research
 * @author Justin Deoliveira, The Open Planning Project
 * @since 2.5
 */
public interface ServiceInfo {

    /**
     * Human readable title representing the service.
     *
     * 
The title is used to represent the service in the context of a user interface and should
     * make use of the current Locale if possible.
     *
     * @return title, null if unsupported.
     */
    String getTitle();

    /**
     * Keywords associated with this service.
     *
     * 
Maps to the Dublin Core Subject element.
     *
     * @return keywords associated with this service.
     */
    Set getKeywords();

    /**
     * Human readable description of this service.
     *
     * 
This use is understood to be in agreement with "dublin-core", implementors may use either
     * abstract or description as needed.
     *
     * 

     *
     * 

     *   Dublin Core:  A textual description of the content of the resource, including
     *       abstracts in the case of document-like objects or content descriptions in the case of
     *       visual resources.  When providing actual dublin-core metadata you can gather up
     *       all the description information into a single string for searching.
     *   
WMS: abstract
     *   
WFS: abstract
     *   
shapefile shp.xml information
     * 
     *
     * @return Human readable description, may be null.
     */
    String getDescription();

    /**
     * Party responsible for providing this service.
     *
     * Known mappings:
     *
     * 

     *   WMS contact info
     *   
File formats may wish to use the current user, or the last user to modify the file
     * 
     *
     * @return URI identifying the publisher of this service
     */
    URI getPublisher();

    /**
     * A URI used to identify the service type.
     *
     * Maps to the Dublin Code Format element.
     *
     * 

     *
     * 

     *   Service type for open web services
     *   
File format or extension for on disk files
     *   
XML schema namespace for this service type.
     * 
     *
     * 
     *
     * @return URI used to identify service type
     */
    URI getSchema();

    /**
     * Returns the service source.
     *
     * 
Maps to the Dublin Core Server Element.
     *
     * 

     *
     * 

     *   Open web services can use the online resource of their capabilies document
     *   
File formats may wish to use their parent directory
     * 
     *
     * 
     *
     * @return Source of this service
     */
    URI getSource();
}