Test of the shortcode:
[WP_GraphViz title="WP_GraphViz Title" type="digraph" id="testid" showdot="true"]
a1 -> a2 -> a3;
a3 -> a1;
a1 [style=”rounded,filled”, shape=box];
[/WP_GraphViz]
=== Start Shortcode ===
WP_GraphViz Title
wpg_div_testid
=== End Shortcode ===