A Meta SOP class is used where it is required to negotiate a “set” of SOP Classes as a batch, as one would not be useful without the others. The Meta SOP classes still used in DICOM are:

BasicGrayscalePrint

1.2.840.10008.5.1.1.9.1

BasicColorPrint

1.2.840.10008.5.1.1.18.1

GeneralPurposeWorklist

1.2.840.10008.5.1.4.32

In DicomObjects, it is necessary to set the MetaSOPClass property of the DicomAssociation(.NET)/DicomConnection(COM) object explicitly when using these services, as this is the only case where the SOP class of the object being operated on does not necessarily correspond with one of the Presentation Contexts negotiated.