Filter criteria for landmark databases

The following table describes the Filter object properties for GetList calls that retrieve information about landmark databases.

**Table:** Filter object properties for a database search
Property	Description	Type	Value
`[Filter.DbProtocol]`	Specifies the protocol for accessing databases. If this property is specified, `GetList` returns a list of all the databases that use this protocol. If the protocol is not specified, `GetList` returns a list of all the available databases.	string	For example: `"file://"`