org.opengis.filter
Interface PropertyIsNull

All Superinterfaces:

Filter

@XmlElement(value="PropertyIsNull")
public interface PropertyIsNull
extends Filter

Filter operator that checks if an expression's value is null. A null is equivalent to no value present. The value 0 is a valid value and is not considered null.

Since:

GeoAPI 2.0

Version:

Implementation specification 1.0

Method Summary

Expression

getExpression() Returns the expression whose value will be checked for null.

Methods inherited from interface Filter

accept, evaluate

Method Detail

getExpression

@XmlElement(value="PropertyName")
Expression getExpression()

Returns the expression whose value will be checked for null.