private boolean testValidProtocol(Element el, Attribute attr, Set<Protocol> protocols) { // try to resolve relative urls to abs, and optionally update the attribute so output html has abs. // rels without a baseuri get removed String value = el.absUrl(attr.getKey()); if (value.length() == 0) value = attr.getValue(); // if it could not be made abs, run as-is to allow custom unknown protocols if (!preserveRelativeLinks) attr.setValue(value); for (Protocol protocol : protocols) { String prot = protocol.toString(); if (prot.equals("#")) { // allows anchor links if (isValidAnchor(value)) { return true; } else { continue; } } prot += ":"; if (lowerCase(value).startsWith(prot)) { return true; } } return false; }