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

Field Summary
 
Fields inherited from interface Filter
EXCLUDE, INCLUDE
 
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.



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