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Expressions can be used for many purposes: to select items, to create a new attributes, perform queries...

The user can use using a single properties or combine several properties into a mathematical expression. MithraSIG will calculate the value for the expression in the same way as many computer programming languages.

The expression can use mathematical operators, functions and spatial searches.

For example :

_area#*MITHRA::height# will create a new schema or attribute calculating the volume of the building.

MITHRA::P0::light_vehicles_speed# used in a theme on the roads can color them depending of the speed or display the speed as text.

For more information about expressions and their syntax, see List of expressions.