The provided text is rather lengthy and not easy to read. I suggest to give it more structure to improve readability.

Moreover, stating: "where current is determined by the evaluation" causes more questions than it answers. e.g.: Who, when and what is to be evaluated to determine the current context?

Existing Wording:

As the following diagram illustrates, in the Unfiltered context, this retrieve will return all the encounters in the underlying system, whereas in the Patient context, this retrieve will return only encounters for the current patient, where current is determined by the evaluation:

<FIGURE>

Proposed Wording:

Depending on the context the retrieve above will return:

• Unfiltered - all the encounters in the underlying system.
• Patient - only encounters for the current patient (e.g. PAT-100)

Consider the figure below: