OSComplexTypes.xsd 3.0 2005/03/09 Ordnance Survey, (c) Crown Copyright. All Rights Reserved March 2005. See http://www.ordnancesurvey.co.uk/xml/schema for guidelines and related information This schema defines the complex types used as properties on features. + identifies that the relationship refers to the edge in its natural direction, i.e. the direction that the geometry is in. - identifies that it is in the opposite direction, i.e. the direction opposite to the geometric coordinates. the xml:lang attribute specifies the language of the enclosed text according to the ISO 639-1 specification. en : English cy : Welsh gd : Gaelic; Scottish Gaelic.