resolveNamedElement method
      
T?
resolveNamedElement(
    
    
- DOMElement? domParent,
- T? parent,
- DOMElement domElement,
- DOMTreeMap<T> treeMap,
Implementation
T? resolveNamedElement(DOMElement? domParent, T? parent,
    DOMElement domElement, DOMTreeMap<T> treeMap) {
  if (namedElementProvider == null) return null;
  var elementName = domElement.getAttributeValue(namedElementAttribute);
  if (elementName != null && elementName.isNotEmpty) {
    var element = namedElementProvider!(elementName, _domGenerator, treeMap,
        domParent, parent, domElement.tag, domElement.domAttributes);
    return element;
  } else {
    return null;
  }
}