Introduction This schema defines DICOM UIDs. User can update this file to support new DICOM object types. Structure Overview Question mark "?" means optional items. Plus "+" means one or more items. Asterisk "*" means zero or more items. DICOM_UID_DEFINITIONS DOCUMENT_HEADER? DOCUMENT_CHANGE_LOG* DOCUMENT_MODIFIER DOCUMENT_MODIFICATION_DATE DOCUMENT_VERSION? MODIFICATION_COMMENT? BASE_DOCUMENT? BASE_DOCUMENT_RELEASE_DATE? BASE_DOCUMENT_DESCRIPTION? UID_DEF (classification, isLE?, isEVR?, isCompressed?,retired?, contentType?)+ UID NAME DESCRIPTION? A UID_DEF entry describes a UID value. The mandatory classification attribute specifies what a UID is. Its value can be "transferSyntax", "storageClass", "frameOfRef", "ldapOID", "entityID", or "other". "transferSyntax" means that the UID identifies transfer syntax. "storageClass" means that the UID identifies a storage class. "frameOfRef" means that the UID is a well-known frame of reference. "ldapOID" means that the UID is an LDAP OID. "entityID" means that the UID identifies an entity, which can be an organization or a device manufacturer. "other" means that the UID does not fall into any of the previous categories. For entries that have a classification type of "transferSyntax", the attributes "isLE", "isEVR", and "isCompressed" further define the transfer syntax. These attributes are ignored for all other classification types. The "isLE" attribute specifies whether the binary stream will be encoded with little-endian byte order(defaults to true). The "isEVR" attribute specifies whether the binary stream will use the explicit VR encoding rule (defaults to true). The "isCompressed" attribute specifies whether the transfer syntax means that the image content is compressed (defaults to true). If an entry has a classification type of "storageClass", the "contentType" attribute further specifies the primary content of a DICOM object belonging to this class. The value of this attribute can be "image", "waveform", "report" or "other". "image" can be single-frame, multi-frame images, or video. "waveform" can be ECG, EEG, or any other 1D signal. "report" means a structured report. "other" means overlay, GSPS, KO, or any other object types that do not belong to the previous categories. For example "Ultrasound Multi-frame Image Storage" SOP class has a UID of "1.2.840.10008.5.1.4.1.1.3.1". Its primary content is image.