code: protected NodeList getTagChildren(String tagName, Element element) {
          return element.getNamespaceURI() == null ? element.getElementsByTagName(tagName) : element.getElementsByTagNameNS(
              element.getNamespaceURI(), tagName);
      }
docs: Returns the children under the specified tag. Compensates for namespace usage.
  
  @param tagName Name of tag whose children are sought.
  @param element Element to search for tag.
  @return Node list containing children of tag.