XML schema to define and validate CDB Vector Attributes as defined in chapter 5 of CDB Specification v3.2 CDB is an OGC Standard. Copyright (c) 2016 Open Geospatial Consortium. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/. Attributes are defined through 3 lists: 1) the attributes themselves, 2) their units, and 3) their scalers. This attribute represents the version number of this file. It has two components: major.minor.