Abstract base class for filters that compare exactly two values against each other.
Abstract super-interface for logical operators that accept two or more other logical values as inputs.
Defines a constraint that can be checked against an instance of an object (Usually a Feature).
Allows creation of additional Filter constructs.
A filter that passes only the Identifiers listed.
Defines a filter that supports filtering on multi-valued attributes.
Reverses the logical value of an expression.
A compact way of encoding a range check.
Filter operator that compares that its two sub-expressions are equal to each other.
Filter operator that checks that its first sub-expression is greater than its second subexpression.
Filter operator that checks that its first sub-expression is greater or equal to its second subexpression.
Filter operator that checks that its first sub-expression is less than its second subexpression.
Filter operator that checks that its first sub-expression is less than or equal to its second subexpression.
Filter operator that performs the equivalent of the SQL "
Filter operator that checks if an expression's value is nil.
Filter operator that compares that its two sub-expressions are not equal to each other.
Filter operator that checks if an expression's value is
Indicating "filter all", evaluates to
Indicating "no filtering", evaluates to
Enumerated type for MatchAction property (used by comparison and geometry operations): When one or more of the operands evaluates to multiple values rather than a single value, which action should be taken?
The following is adapted from the OpenGIS® Filter Encoding Implementation Specification:
A comparison operator is used to form expressions that evaluate
the mathematical comparison between two arguments. If the arguments satisfy the comparison
then the expression evaluates to
Otherwise the expression evaluates to
A logical operator can be used to combine one or more conditional expressions.
The logical operator
And evaluates to
true if all the combined
expressions evaluate to
true. The operator
Or operator evaluates
true is any of the combined expressions evaluate to
Not operator reverses the logical value of an expression.
Not can be used to combine scalar,
spatial and other logical expressions to form more complex compound expressions.
Identity can be checked using
Id, selected objects
will are matched against a set of
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