From: Dr. Olaf Hoffmann <Dr.O.Hoffmann@gmx.de>

Date: Sun, 15 Oct 2006 16:03:14 +0200

To: www-svg@w3.org

Message-Id: <200610151603.14819.Dr.O.Hoffmann@gmx.de>

Date: Sun, 15 Oct 2006 16:03:14 +0200

To: www-svg@w3.org

Message-Id: <200610151603.14819.Dr.O.Hoffmann@gmx.de>

Hello, two more comments about the 'Constrained Transformations' chapter: 1. In 7.7.3 it is noted: "Similarly, we use the following notation for the transform defined by the transform attribute on the given element with identifier 'elt'. Txf(id)" Is this correct/intended or should it be "Similarly, we use the following notation for the transform defined by the transform attribute on the given element with identifier 'id'. Txf(id)" or "Similarly, we use the following notation for the transform defined by the transform attribute on the given element with identifier 'elt'. Txf(elt)" ? 2. In 7.7.5 several times the inverse of a matrix is used. In most cases I can visualise the visible effect of the TransformRef/ref(svg)/ref() value, but in the formal description it is missed what happens, if the inverse of the matrix does not exist. In most ot these cases it is anyway possible to get the described effect, but of course not using the not existing inverse matrix. Another method has to be used, what is possible with the given information in a SVG document, but not described. Currently I have only one example containing animation with a case without an inverse, I cannot visualise the visible effect of TransformRef in a well-defined way (infinite types of behaviour are consistent with the description in this case). Therefore a description is needed for practical reasons too, not just for formal mathematical reasons, what happens, if the inverse does not exist, to provide well-defined behaviour. Another (not my) problem may occur to get the correct visual effect for implementors in general, if the inverse does not exist.Received on Sunday, 15 October 2006 14:05:51 GMT

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