## Package org.opengis.parameter

Description and storage of parameter values.

See:
Description

Interface Summary
GeneralParameterDescriptor: Abstract definition of a parameter or group of parameters used by an operation method.
GeneralParameterValue: Abstract parameter value or group of parameter values.
ParameterDescriptor<T>: The definition of a parameter used by an operation method.
ParameterDescriptorGroup: The definition of a group of related parameters used by an operation method.
ParameterValue<T>: A parameter value used by an operation method.
ParameterValueGroup: A group of related parameter values.

Exception Summary
InvalidParameterCardinalityException: Throws if adding a parameter value to a group would result in more parameters than the maximum occurence allowed.
InvalidParameterNameException: Thrown when an unexpected parameter was found in a parameter group.
InvalidParameterTypeException: Thrown when a parameter can't be cast to the requested type.
InvalidParameterValueException: Thrown when an invalid value was given to a parameter.
ParameterNotFoundException: Thrown when a required parameter was not found in a parameter group.

## Package org.opengis.parameter Description

Description and storage of parameter values. The first two paragraphs below are adapted from OpenGIS® Spatial Referencing by Coordinates (Topic 2) specification.

Most 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.

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 parameter groups. Two or more parameter groups are then associated with a particular operation method, and each parameter group consists of a set of 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.

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