The Problem Observation (V3) template in section 3.79 item 9.a (page 737) states as follows:

For example, SNOMED CT allows constructing concepts as a combination of multiple codes. SNOMED CT defines a concept "pneumonia (disorder)" (233604007) an attribute "finding site" (363698007) and another concept "left lower lobe of lung (body structure)" (41224006). SNOMED CT allows one to combine these codes in a code phrase, as shown in the sample XML.

However the following sample XML in Figure 198 (page 740) doesn't contain a SNOMED CT code phrase. It only contains a single SNOMED CT term. I recommend we update the sample with a SNOMED CT postcoordinated expression. And consider adding an informative link to the HL7 Version 3 Implementation Guide: TermInfo - Using SNOMED CT in CDA R2 Models, Release 1.