processing instructions paragraphs

Here a snippet that will add a Note object to the end of a paragraph.
Just select an insertion point and run the snippet:

// Insertion point of some text selected:
var paragraph = app.selection[0].paragraphs[0];
// Two cases:
// 1. Paragraph ends with a paragraph marker:
if(paragraph.characters[-1].contents == "\r")
{
    var lastInsertionPoint = paragraph.insertionPoints[-2];
}
else
// 2. Paragraph does not end with a paragraph marker:
{
    var lastInsertionPoint = paragraph.insertionPoints[-1];
}
// Add a note at last insertion point:
var note = lastInsertionPoint.notes.add({ collapsed : false });
// Add some instructions inside the note, that can be read in Story Editor Window:
note.texts[0].contents =
Date.now().toString() +"\r"+
"Processing Instruction: Do something with that paragraph!";

If you open the the text in Story Window you'll see this:

One could debate if Date.now().toString() will create a unique string, but for the moment it will fit.

Regards,
Uwe