Github user YolandaMDavis commented on the issue:
https://github.com/apache/nifi/pull/571
@alopresto here is a write up of use case and demo of example flow (also
refers to a gist with files from demo)
[Supporting Custom Properties for Expression
Languages.docx](https://github.com/apache/nifi/files/366969/Supporting.Custom.Properties.for.Expression.Languages.docx)
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