procedure RemovePageObjectMarkParam(Index, MarkIndex: Integer; const Key: WString);
| Index | Integer. Zero-based index of the page object. |
| MarkIndex | Integer. Zero-based index of the mark within that object. |
| Key | WString. Name of the property to remove. Keys are PDF names, so the round trip is lossless over the ASCII range. |
Narrower than RemovePageObjectMark: the mark and its remaining properties stay in place, only the named entry goes
Removing a key that is not present leaves the mark unchanged
Call UpdatePage before saving so the edited property list reaches the file