/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2011, Open Source Geospatial Foundation (OSGeo)
* (C) 2003-2005, Open Geospatial Consortium Inc.
*
* All Rights Reserved. http://www.opengis.org/legal/
*/
/**
* Description and storage of {@linkplain org.opengis.parameter.ParameterValue parameter values}.
* The first two paragraphs below are adapted from
* <A HREF="http://portal.opengeospatial.org/files/?artifact_id=6716">OpenGIS®
* Spatial Referencing by Coordinates (Topic 2)</A> specification.
*
* <P ALIGN="justify">Most {@linkplain org.opengis.parameter.ParameterValue parameter values} are
* numeric, but for some operation methods, notably those implementing a grid interpolation
* algorithm, the parameter value could be a file name and location (this may be a URI). An
* example is the coordinate transformation from NAD 27 to NAD 83 in the USA; depending
* on the locations of the points to be transformed, one of a series of grid files should be used.</P>
*
* <P ALIGN="justify">Some operation methods may require a large number of coordinate operation
* parameters. Also, some operation methods require that groups of parameters be repeatable as
* a group. In such cases, it is helpful to group related parameters in
* {@linkplain org.opengis.parameter.ParameterDescriptorGroup parameter groups}. Two or more parameter
* groups are then associated with a particular operation method, and each parameter group consists
* of a set of {@linkplain org.opengis.parameter.ParameterDescriptor operation parameters}, or other,
* nested parameter groups. This way of modelling is not mandatory; all coordinate operation
* parameters may be assigned directly to the coordinate operation method.</P>
*
* @version <A HREF="http://portal.opengeospatial.org/files/?artifact_id=6716">Abstract specification 2.0</A>
* @since GeoAPI 1.0
*/
package org.opengis.parameter;