Help for selector JSON

[rdegr]

What is represented by the value of the 't' attribute below? I need to build similar selectors, that doesn't seem to correspond to anything in the metadata for the related category. I'm trying to build a filter that lets you select different fields, then a value from the field, but createSelectionId() is creating selectors that filter across multiple fields which is not desired.

"{"selector":"{\"data\":[\"{\\\"comp\\\":{\\\"k\\\":0,\\\"l\\\":{\\\"col\\\":{\\\"s\\\":{\\\"e\\\":\\\"qtEmergencyRecords\\\"},\\\"r\\\":\\\"Year\\\"}},\\\"r\\\":{\\\"const\\\":{\\\"t\\\":4,\\\"v\\\":2017}}}}\"]}","highlight":false}"

[irisp]

First please format and validate your JSON data using 

https://jsonformatter.org/json-parser or https://codebeautify.org/jsonvalidator.

[rdegr]

Irisp, that's not "my" JSON, its a selector query string I captured while debugging selection activities. It's string data from a larger JSON object, thus the escapes. Can you answer my question?