I pushed a change draft for Issue #298 : “Only 'index' properties should be used for array lookup.” Documents/ChangeDrafts/Active/sarif-v2.0-issue-298-index-properties-required.docx We will move its adoption at TC #30 on Wednesday, January 9 th . See my last comment in the issue for a description of the change, and its motivation. Despite being conceptually simple, the spec changes are more extensive than I expected. Please look carefully, and you might find it necessary to switch back and forth between Full Markup and Simple Markup to understand the changes. Thanks, Larry