.github/xmllint.json

{
  "problemMatcher": [
    {
      "owner": "xmllint",
      "severity": "error",
      "pattern": [
        {
          "regexp": "^(.*):(\\d+):(.*)$",
          "file": 1,
          "line": 2,
          "message": 3
        }
      ]
    }
  ]
}