70 September 2005 XMP Specification XMP Schemas EXIF Schemas 4 EXIF Schema for Additional EXIF Properties The following table lists additional properties that describe the equipment used to produce EXIF data. ● The schema name is http://ns.adobe.com/exif/1.0/aux/ ● The preferred schema namespace prefix is aux Data Representation and Conversion This section describes the mapping from the native EXIF 2.2 metadata format to the XMP format. It explains how to do the conversion without losing significant data, and describes the resulting XMP representation. NOTE: If a particular tag is omitted from an EXIF file, the corresponding XMP property must also be omitted. An XMP property must not be created based on the default value of a missing EXIF tag. The EXIF to XMP type mappings are designed to be lossless in most cases. The main issues are for EXIF text values. When converting from XMP, integers that are specified optionally as short or long in EXIF should be represented as short if the value is in the range −32768 to +32767, otherwise they should be long. EXIF Text EXIF text values are a sequence of ASCII characters with a null terminator XMP text values are Unicode characters in UTF-8 with no null terminator. When converting EXIF to XMP, the null terminator is dropped the remaining ASCII codes are legitimate UTF-8 values. When converting from XMP to EXIF, non-ASCII characters are escaped (using URL escaping as specified in http://www.w3.org/Addressing/URL/4_Recommentations.html) ASCII exif:GPSDifferential Closed choice of Integer Internal GPS tag 30, 0x1E. Indicates whether differential correction is applied to the GPS receiver: 0 = Without correction 1 = Correction applied Property Value Type Category Description aux:Lens Text Internal A description of the lens used to take the photograph. For example, “70-200 mm f/2.8-4.0”. aux:SerialNumber Text Internal The serial number of the camera or camera body used to take the photograph. Property Value Type Category Description