Unless otherwise specified, content in an SR tree is “directly” observed. When material is quoted (from a source that is either a document or something spoken), then it is necessary to specify:
the fact that one is quoting
who is doing the quoting
the source of the quote
who is being quoted, and who and what the quote is about
This template establishes a mechanism for quoting by specifying:
the fact that one is quoting, by the presence of the contents of the template in the tree
that the “observer context” above the invocation of this template establishes who is doing the quoting
the source of the quote, by the values of the content items in this template
who is being quoted, and who and what the quote is about, by the observation context that is established at the start of the quoted material
This template may be invoked recursively, to nest quotes within quotes. In essence, the chain of who is quoting whom can be established by maintaining a “stack” of observer context.
If a dimension of observation context is the same in the quoted material as in the enclosing tree, then the observation context does not need to be respecified (e.g. the quote may be about the same subject or procedure). Typically, the observer context would change (unless one were quoting oneself).
In the case of quoting something that was spoken, the “observer” is the person speaking.
TID 1000 is attached using HAS OBS CONTEXT relationships to the top node of the material that is being quoted. The presence of the Quoted Source concept signals the fact that the material is quoted rather than directly observed.
TID 1000 QUOTATION Type: Extensible Order: Significant
|NL||Rel with Parent||VT||Concept Name||VM||Req Type||Condition||Value Set Constraint|
|1||HAS OBS CONTEXT||CODE||EV (121001, DCM, “Quotation Mode”)||1||M||EV (121003, DCM, “Document”) EV (121004, DCM, “Verbal”)|
|2||HAS OBS CONTEXT||COMPOSITE||EV(121002,DCM,”Quoted Source”)||1||MC||Required if quoted material source is a DICOM composite object|
|3||HAS OBS CONTEXT||INCLUDE||DTID (1001) "Observation Context"||1||M|