/** @return null if child doesn't exist. */
public static String allTextFromUniqueChild(Element elem, String childTagName, boolean trim)
throws DOMException {
Element uniqueChild = uniqueChildByTagName(elem, childTagName);
if (uniqueChild == null) return null;
else return DomParseUtils.allTextFromElement(uniqueChild, trim);
}
public static String allTextFromUniqueImmediateChild(Element elem, String childTagName)
throws DOMException {
Element uniqueChild = uniqueImmediateChildByTagName(elem, childTagName);
if (uniqueChild == null) return null;
return DomParseUtils.allTextFromElement(uniqueChild);
}