The NiFi Expression Language provides the ability to reference these attributes, compare them to other values, and manipulate their values. Structure of a NiFi Expression. The NiFi Expression Language always begins with the start delimiter ${and ends with the end delimiter }. Between the start and end delimiters is the text of the Expression ... should only allow yourself 90 minutes to take this test and should take the entire test in one sitting. If possible, take the test in a quiet room where you will not be interrupted. When you have completed the test, you should score your test using the answer key and scoring instructions provided on the last page.

Nov 07, 2017 · Some NiFi Expression Language (EL) expressions can be fairly complex, or used in a large flow, or both. These can make it difficult to test an EL expression on a running NiFi system.