Hi Tavmjong I have been looking at how the styles are written from the "style" attribute-value pairs in XML editor to the svg file when drawing is saved. It is done via sp_repr_css_write_string() in repr-css.cpp. On applying the extension, the block that is written has been implemented via merge_styles.py script (revision 13161). How is the script connected and extracting various style values from the XML editor and showing it up as a class? -- Kamalpreet Kaur Grewal Blog: http://kamalpreetgrewal.com/