3 The example shows how to obtain specific coordinates in a (La)TeX text. This
4 allows to mark specific portions of text, setting arrows, braces and many
5 more. A marker can be set with the command `\PyXMarker`... which takes the
6 name of the marker as an argument (`id` in the example code). The position of
7 the marker can then be obtained from the textbox, which is returned by the