Explicit and Implicit VR coexisting in file meta data

[chengyanliang]

Is it legal for tags ecoded in Explicit and Implicit VR to coexist in file meta data? Are group 2 tags always encoded in Explicit VR?

[chengyanliang]

Group 2 tags are so-called meta-header and always encoded in Explicit VR Little Endian transfer syntax. All other main dataset should be encoded in either Explicit or Implicit VR.