+#define UI1_2_840_10008_1_2 "1.2.840.10008.1.2"
+#define UI1_2_840_10008_1_2_1 "1.2.840.10008.1.2.1"
+#define UI1_2_840_10008_1_2_2 "1.2.840.10008.1.2.2"
+#define UI1_2_840_10008_1_2_1_99 "1.2.840.10008.1.2.1.99"
+
+ // Fourth semantics:
+ //
+ // ---> Warning : This fourth field is NOT part
+ // of the 'official' Dicom Dictionnary
+ // and should NOT be used.
+ // (Not defined for all the groups
+ // may be removed in a future release)
+ //
+ // CMD Command
+ // META Meta Information
+ // DIR Directory
+ // ID
+ // PAT Patient
+ // ACQ Acquisition
+ // REL Related
+ // IMG Image
+ // SDY Study
+ // VIS Visit
+ // WAV Waveform
+ // PRC
+ // DEV Device
+ // NMI Nuclear Medicine
+ // MED
+ // BFS Basic Film Session
+ // BFB Basic Film Box
+ // BIB Basic Image Box
+ // BAB
+ // IOB
+ // PJ
+ // PRINTER
+ // RT Radio Therapy
+ // DVH
+ // SSET
+ // RES Results
+ // CRV Curve
+ // OLY Overlays
+ // PXL Pixels
+ // DL Delimiters
+ //
+
+ // Other usefull abreviations :
+ //Radiographic view associated with Patient Position (0018,5100).
+ // Defined Terms:
+ //
+ // AP = Anterior/Posterior
+ // PA = Posterior/Anterior
+ // LL = Left Lateral
+ // RL = Right Lateral
+ // RLD = Right Lateral Decubitus
+ // LLD = Left Lateral Decubitus
+ // RLO = Right Lateral Oblique
+ // LLO = Left Lateral Oblique
+