public static void markReadBlock(OMElement line) {
Coord startPoint = GraphUtilities.extractStartCoord(
line.getAttribute("d"));
OMSVGCircleElement block = OMSVGParser.currentDocument(
).createSVGCircleElement(startPoint.x, startPoint.y, 2.0f);
block.getStyle().setSVGProperty(
SVGConstants.CSS_FILL_PROPERTY,
SVGConstants.CSS_RED_VALUE);
block.setAttribute(READ_BLOCK_ATTR, "true");
line.getParentNode().appendChild(block);
}