Created attachment 180542 [details]
Shape with glue-point-type="segments"
The attribute draw:glue-point-type (19.174 ODF 1.3) is not implemented. The attached file has a shape where this attribute is set to value "segments". That should result in a gluepoint in each vertex of the shape.
Especially the value "segments" is very useful, because it gives the glue-points without listing them.
The MS binary format has this as property "cxk" with type MSOCXK, VML as connecttype. Both corresponds to ODF. So implementing the ODF feature would help in filters too.