Another important aspect of CDA documents is the idea of "negation". This is an important piece of semantic expression within a clinical document as it is used to indicate that something "did not". This is expressed as a "negationInd" attribute on entries and when encountered should be interpreted as a "not" occur. Figure 16 represents an observation indicating a patient is "NOT" pregnant.
Figure 16 - Example of negation
<observation classCode="OBS" moodCode="EVN" negationInd="true">
...
<code code="418799008" codeSystem="2.16.840.1.113883.6.96" codeSystemName="SNOMED CT" displayName="Symptom"/>
...
<value xsi:type="CD" code="77386006" codeSystem="2.16.840.1.113883.6.96" codeSystemName="SNOMED CT" displayName="Patient currently pregnant"/>
...
</observation>

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