Whats the 'parent' of a footnote?

Markus, thanks for Your suggestions.

However, I have tried with these already, but they report "undefined" in all cases independently of the cases 1 … 4 mentioned.

function CollectFootnotesInDoc (oDoc) { 
// Arguments oDoc   Current document
// Returns   Number of Footnote collected in globarl array
var docStart, foundTR, k, nNotes=0, oFindParams, oFnTI, oTextItem, tloc;
    
  goFno.aoFNcollected.length = 0;                             // clear array
  docStart = oDoc.MainFlowInDoc.FirstTextFrameInFlow.FirstPgf;
  tloc = new TextLoc (docStart, 0);
  oDoc.TextSelection = new TextRange (tloc, tloc); // essential
  oFindParams= Fno_GetFindParameters (7, "");     // Find footnote anchor
  foundTR = oDoc.Find(tloc, oFindParams);
  while (foundTR.beg.obj.ObjectValid()) {  
$.bp(true);
    var oX1 = foundTR.beg.obj.IntextFrame;        // undefined in all cases
    var oX2 = foundTR.beg.obj.IntextObj;          // "
    oFnTI = oDoc.GetTextForRange (foundTR, Constants.FTI_FnAnchor);
    for (k = 0; k < oFnTI.length; k++) {          // although k always 0 loop essential
      oTextItem = oFnTI;
//    var oX1 = oTextItem.obj.IntextFrame;        // undefined in all cases
//    var oX2 = oTextItem.obj.IntextObj;          // "
//    var oX3 = oTextItem.obj.FirstPgf.IntextFrame;        // undefined in all cases
//    var oX4 = oTextItem.obj.FirstPgf.IntextObj;          // "
      goFno.aoFNcollected.push(oTextItem.obj);    // object Fn
      nNotes += 1;                                // statistics
    }
    tloc = foundTR.end;                           // prepare for next find
    foundTR = oDoc.Find(tloc, oFindParams);
  } 
  return nNotes;
} //--- end CollectFootnotesInDoc  

BTW the Find method is necessary to get the footnotes in the order of appearance in the document. The method oDoc.FirstFnInDoc … oFn.NextFnInDoc

gives the order of creation.

Today I will try my idea from the late evening: See Edited in the first post.

Edit

The following works as expected

function Fno_CollectFootnotes (oDoc) { //=== collect 'ordinary' footnotes in current document =========
// Arguments oDoc   Current document
// Returns   Number of Footnote collected in globarl array
// Comment   Collect only the footnotes from the main flow, not table footnotes
//           and not fn's from nested frames.
var oPgf, k, nNotes=0, oFindParams, aoTextItems, oTextItem;
  goFno.aoFNcollected.length = 0;                 // clear array
  oPgf = oDoc.MainFlowInDoc.FirstTextFrameInFlow.FirstPgf;
  while (oPgf.ObjectValid()) {
    aoTextItems = oPgf.GetText(Constants.FTI_FnAnchor);
    for (k = 0; k < aoTextItems.length; k++) {    // there may be more than one
      oTextItem = aoTextItems;
      goFno.aoFNcollected.push(oTextItem.obj);    // object Fn
      nNotes += 1;                                // statistics
    }
    oPgf = oPgf.NextPgfInFlow;
  } 
  return nNotes;
} //--- end Fno_CollectFootnotesInDoc