Introduction This schema defines the data dictionary that lists the DICOM standard attributes as published by the DICOM standard committee. No other attributes, such as those defined by a modality manufacturer or an organization other than NEMA, should be included in the standard data dictionary. Structure Overview Question mark "?" means optional items. Plus "+" means one or more items. Asterisk "*" means zero or more items. DICOM_STANDARD_ATTRIBUTES DOCUMENT_HEADER? DOCUMENT_CHANGE_LOG* DOCUMENT_MODIFIER DOCUMENT_MODIFICATION_DATE DOCUMENT_VERSION? MODIFICATION_COMMENT? BASE_DOCUMENT? BASE_DOCUMENT_RELEASE_DATE? BASE_DOCUMENT_DESCRIPTION? ATTRIBUTE_DEFINERS? DEFINER+ NAME ID? STANDARD_ATTRIBUTE_DEFINITION+ TAG NAME VR? VM? RETIRED? DOCUMENT_HEADER is an optional header to specify the modification history. See dt:DOCUMENT_HEADER_T for more information. ATTRIBUTE_DEFINERS specify the owner of each attribute. See dt:ATTR_DEFINER_T for more information. All DICOM standard attributes must have definer name "DICOM" and UID "1.2.840.10008.1". A standard dictionary contains one or more standard attribute definitions. Each standard attribute specification takes a tag specification, a name, a value representation type, a value multiplicity type, and a retired flag. See DICOM P3-6 2011 for a description of these elements. See dt:VR_T dt:VM_T for the allowed values of value representation and value multiplicity elements. Note: Wildcard character "x" can be used to specify standard attribute tags (for example, 60xx0010 for overlay rows). Multiple attribute definitions must not be associated with the same tag in a standard dictionary. For example, the attribute definition 60100010 matches the wildcard attribute 60xx0010, they cannot coexist in the dictionary. As a rule, an attribute must not match two entries in the dictionary.