// unsigned 16 bit integers in Dicom) expressed in hexadecimal.
// Example: consider the tag given as (group, element) = (0x0010, 0x0010).
// Then the corresponding TagKey shall be the string 0010|0010 (where
// unsigned 16 bit integers in Dicom) expressed in hexadecimal.
// Example: consider the tag given as (group, element) = (0x0010, 0x0010).
// Then the corresponding TagKey shall be the string 0010|0010 (where