     }
 
 
-    ///
+    /// Determines the length of (ALL) of the Nodes at a specified Column, given a collection of Branches.
     ///
     private func lengthOfElements(atColumnIndex index: Int, in branches: [Branch]) -> [ElementNode: Int] {
         var lengths = [ElementNode: Int]()

//
private extension NSAttributedStringToNodes {

    ///
    ///
    typealias Branch = (nodes: [ElementNode], leaves: [Node])


    }


    /// Extracts the Video Source Attribute from a VideoAttachment Instance.
    ///
    private func videoSourceAttribute(from attachment: VideoAttachment) -> StringAttribute? {
        guard let source = attachment.srcURL?.absoluteString else {
