private static IEnumerable <VertexElementLayout> LoadLayoutElements(XContainer container)
{
// Element tags have the format:
// <value stream="(stream)" offset="(offset)" type="(type)" usage="(usage)" usageIndex="(usage index)" />
return(from element in container.Elements("value")
select new VertexElementLayout(
XMLUtil.GetNumericAttribute(element, "stream"),
XMLUtil.GetNumericAttribute(element, "offset"),
XMLUtil.GetEnumAttribute <VertexElementType>(element, "type"),
XMLUtil.GetEnumAttribute <VertexElementUsage>(element, "usage"),
XMLUtil.GetNumericAttribute(element, "usageIndex")));
}