new CssValidator(CssSchema.getDefaultCss21Schema(mq),
HtmlSchema.getDefault(mq), mq)
.validateCss(AncestorChain.instance(t));
new CssRewriter(uriPolicy, CssSchema.getDefaultCss21Schema(mq), mq)
.rewrite(AncestorChain.instance(t));
t.acceptPreOrder(new Visitor() {
public boolean visit(AncestorChain<?> ancestors) {
ParseTreeNode node = ancestors.node;
if (node instanceof CssTree.UriLiteral) {
String value = ((CssTree.CssLiteral) node).getValue();
if (node instanceof SafeUriLiteral) {