This is the Spatial Schema for the MIDAS standard, part of the FISH suite of XML schemas for the historic environment . The three primary elements are: (1) Place: address and attribute information; (2) Geometry: geometric (coordinate-based) data; and (3) Representations: where representations of that place are represented, usually on a map. Node for recording place and space information. Primary MIDAS spatial element used to record attribute information about a spatial entity. Empty element for recording custom or country specific representations that are neither postal nor cadastral. This has been left intentionally broad so as to accommodate all possible UK and international variants. The element itself is empty, and is comprised of repeatable 'location' nodes. Use the 'type' attribute to qualify the type of location, such as "country" or "parish", and use the 'namespace' attribute to provide a context for the value, such as a specific database or gazetteer. Grid reference(s): string representations of place, e.g. "SU123456". The 'namespace' parameter provides context to the gridref: for example, "OSGB36" for the British grid. Used to represent a geopolitical unit that does not fall within the 'address' element. In the UK, values would be "Scotland", "England", "Wales", and "Northern Ireland", while the 'type' attribute for these values would be "Country". Used to identify place within the context of a specified cadastral namespace. In the UK, field numbers would be referenced as cadastral units. UK users are recommended to use the map title and year for the namespace when referring to field numbers taken from OS map sheets. A 'free text' node included to accommodate directions to a place whose absolute position is unknown. Used to record coordinate representations of spatial entities. For SRS use EPSG (http://www.epsg.org/) identifiers. Note that this element records a spatial entity using co-ordinate data, not an assigned name for that place, for which see 'appellation'. Records the bounding polygon; repeatable for multiple SRS (spatial reference systems). Also sometimes called the MBR (Minimum Bounding Rectangle). The EPSG code shall be employed where available. This shall take the form of "EPSG:XXX", where "XXX" is the EPSG code for the referenced coordinate system; "none" shall be provided if the coordinate system is unreferenced. Defines a single conceptual representation of the monument. An appellation can be represented by one or more spatial entities, such as a number of lines, a point cluster, one or more polygons, etc. For example, the same site can be represented by two entities: a point and a polygon. The element is designed to provide a convenient to record the centroid of the spatial appellation, or a coarse approximation of its location. While use of the entity/wkt element is encouraged, it is recognised that not all systems will be able to easily parse wkt notation. This element therefore acts as a 'shortcut', designed to hold a single coordinate pair representing all spatial entities within an appellation. This element stores the actual coordinate information, the precision of the data, and the precision at which it is delivered (if it differs from above). An appellation will often consist of multiple entities. Entities are repeatable and used to record various spatial representations of a single appellation. Well Known Text (wkt) representation of entity. The wkt format is a common standard for the textual description of simple feature geometries. The precision at which the spatial data is stored. This is not to be confused with the precision of the data capture means or mechanism. The value shall be a number. The precision of delivered data, if different from stored precision. This node is included so that the end user can be informed of any spatial obfuscations that have been performed on the data before delivery. This value shall be one of Geometry Object Classes specified in the OGIS Simple Feature Specification: Geometry; Geometry Collection; Point; MultiPoint; Curve; Linestring, Line, LinearRing; MultiCurve; MultiLineString; Surface; Polygon; MultiSurface; or MultiPolygon. The unique identifier of the spatial entity, usually a TOID or a record identifier from a spatial database. This is not to be confused with the identifier for the monument or event being described. The namespace in which the uri is unique. Height of entity above datum. Area of spatial appellation. The 'units' attribute is required. Spatial data capture method: GPS, map, etc. The spatial data source. Visual representations of this place, usually a map tile reference or identifier of an areial photograph. A single representation of this place, usch as a map tile, i.e. 'SU1245'