Use this property to retrieve a bookmark referenced by full name
or zero-based index.
Bookmarks can be referenced by name or by index. The type of the
value you pass is used to determine whether you are looking by name
or by index.
If you intend to reference an item by index, pass a number. If
you intend to reference an item by name, pass a string. In cases
where a string is passed but no matching items could be found, an
attempt will be made to convert the string to a number and return
an item with that index.