**Inheritance:** java.lang.Object, [com.aspose.words.Node](../../com.aspose.words/node/), [com.aspose.words.CompositeNode](../../com.aspose.words/compositenode/), [com.aspose.words.InlineStory](../......reference mark // will be its index among all the section's footnotes...footnote will use instead of its index number. footnote.setReferenceMark("RefMark");...