The following example shows the polyline object:
<polyline name="Polyline1" height="112" width="111" left="235" top="368" visible="true" wallpaper="false" isReferenceObject="false" backStyle="solid" backColor="palegoldenrod" foreColor="#40FF10" lineStyle="solid" lineWidth="1" patternStyle="none" patternColor="#00C000" path="284 370 261 406 299 415 235 429 345 479 344 466 335 403 329 406 326 377 290 368">
<animations>
<animateFill expression="system\Second" fillMin="0" fillMax="100" fillDirection="down" insideOnly="true">
<defaultExpressionRange />
</animateFill>
</animations>
</polyline>