Additional feature filters which compare the feature's property value with the one specified in the query, resulting in a subset of features.

The usage of multiple property names represents an AND operation. The usage of a comma (,) separating the properties values, represents an OR operation.

Properties initiated with 'f.' are used to access values which are added by default in the stored feature. The possible values are: 'f.id', 'f.createdAt', 'f.updatedAt'.

Properties initiated with 'p.' are used to access values in the stored feature which are under the 'properties' property. Use it as a shorthand accessor for 'properties' values.

The format should follow the specification below

• ?p.property_name_1=property_value_1&f.special_property_name_1=special_property_value_1

For example, the above query, the Features are filtered by 'property' AND 'special property' equals to their respective values.

While in the following example

• ?p.property_name_1=value_1,value_2

The resulting Features list contains all elements having value_1 OR value_2.

Additionally, to the operators used in the examples above, the query can be written, with the same semantic, by using the long operators: "=gte=", "=lte=", "=gt=", "=lt=" and "=cs=". The following queries yield the same result:

• ?p.property_name_1>=10
• ?p.property_name_1=gte=10

The available operators are:

• "=" - equals
• "!=" - not equals
• "=.null" - is null
• "!=.null" - is not null
• ">=" or "=gte=" - greater than or equals
• "<=" or "=lte=" - less than or equals
• ">" or "=gt=" - greater than
• "<" or "=lt=" - less than
• "@>" or "=cs=" - Array contains

A list of properties to be returned in the features result list. Multiple attributes can be specified by using comma(,).

Example: ?selection=p.name,p.capacity,p.color,rootpropertyname

• !geometry : special value to omit geometries