How to read the values of custom workitem attributes using REST

Thanks for the answer, Brian.  The Reportable REST API helps a bit.  However I still can't resolve the actual values of the customisable attributes.  Here's an example of my problem:

We have a customised attribute in our Workitem called Dev_Fix_Plan_Attribute.  It is a smallStringValue so when I do a query like:

https://myjazzserver:9443/jazz/rpt/repository/workitem?fields=workitem/workItem[id=41608]/(/)

to get everything about workitem 41608 the Dev Fix Plan attribute is described as:

'Dev_Fix_Plan_Attribute' => {
                        'smallStringValue' => 'Development_Fix_Plan.literal.l1',
                        'longValue' => {},
                        'decimalValue' => {},
                        'displayValue' => 'Development_Fix_Plan.literal.l1',
                        'booleanValue' => {},
                        etc

continued....
                        'type' => 'smallStringValue',
                        'helperId' => '_PLvB8KHDEeSiubWmwVW87Q',
                        'timestampValue' => {},
                        'doubleValue' => '0.0',
                        'largeStringValue' => {},
                        'displayName' => 'Dev Fix Plan'

I'm surprised that even the second URL did not give you the custom attributes, as it works without any issues in my environment. Did you get any attributes that are in the "rtc_ext" name space at all?

Hello Donald:

No, I'm afraid there are no attributes in the "rtc_ext" name space at all in the second query.  Is your environment perhaps later than mine (I'm at Jazz 4.0.6 at the moment)