pvillard31 commented on a change in pull request #4530:
URL: https://github.com/apache/nifi/pull/4530#discussion_r489433534
##########
File path: nifi-docs/src/main/asciidoc/expression-language-guide.adoc
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@@ -131,7 +130,19 @@ the Expression Language between delimiters. Therefore, we
can use the Expression
mean the same thing. We cannot, however, use `${file name:equals(${uuid})}`,
because this results
in `file` and `name` being interpreted as different tokens, rather than a
single token, `filename`.
+[[expression-language-hierarchy]]
+=== Expression Langauge Hierarchy
+When using Expression Language to reference a property by name there is a
defined hierarchy within which NiFi
+will search for the value.
+The current hierarchy in NiFi is as follows:
+1. Search FlowFile for Attribute/key
+2. Search Process Group for attribute/key
Review comment:
```suggestion
2. Search Process Group Variables for attribute/key
```
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