N.3 Behavior of an SCP
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## N.3 Behavior of an SCP

In addition to the behavior for the Storage Service Class specified in Section B.2.2 Behavior of an SCP, the following additional requirements are specified for the Softcopy Presentation State Storage SOP Classes:

- a display device acting as an SCP of these SOP Classes shall make all mandatory presentation Attributes available for application to the referenced images at the discretion of the display device user, for all Image Storage SOP Classes defined in the Conformance Statement for which the Softcopy Presentation State Storage SOP Class is supported.

- a display device that is acting as an SCP of these SOP Classes and that supports compound graphics types shall display the graphics described in the Compound Graphic Sequence (0070,0209) and shall not display the Items in the Text Object Sequence (0070,0008) and Graphic Object Sequence (0070,0009) that have the same Compound Graphic Instance ID (0070,0226) value.

### Note

Though it is not required, a display device acting as an SCP of the Blending Softcopy Presentation State Storage SOP Class may support the Spatial Registration Storage SOP Class in order to transform one Frame of Reference into another or to explicitly identify the relationship between members of two sets of images, and may be able to resample underlying and superimposed sets of images that differ from each other in orientation and in-plane and between-plane spatial resolution.

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