Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/2069
I ran this with a simple `GenFF/ValidateXML/LogAttr` flow and it looks
great. Ran `contrib-check` and all tests pass. +1, merging.
```
--------------------------------------------------
Standard FlowFile Attributes
Key: 'entryDate'
Value: 'Wed Aug 09 21:04:20 PDT 2017'
Key: 'lineageStartDate'
Value: 'Wed Aug 09 21:04:20 PDT 2017'
Key: 'fileSize'
Value: '24'
FlowFile Attribute Map Content
Key: 'filename'
Value: '204498845083507'
Key: 'path'
Value: './'
Key: 'uuid'
Value: 'de5ad824-cea7-442e-8f01-ca01b9aa6e06'
Key: 'validatexml.invalid.error'
Value: 'cvc-elt.1: Cannot find the declaration of element 'this'.'
--------------------------------------------------
<this>is not valid</xml>
```
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