public static @Nullable String getTargetSchemaNsFromTag(final @Nullable XmlTag xmlTag) {
    if (xmlTag == null) return null;
    String targetNamespace = xmlTag.getAttributeValue(TARGET_NAMESPACE_ATTR_NAME, XML_SCHEMA_URI);
    if (targetNamespace == null) targetNamespace = xmlTag.getAttributeValue(TARGET_NAMESPACE_ATTR_NAME, XML_SCHEMA_URI2);
    if (targetNamespace == null) targetNamespace = xmlTag.getAttributeValue(TARGET_NAMESPACE_ATTR_NAME, XML_SCHEMA_URI3);
    return targetNamespace;
  }
public static @Nullable String getTargetSchemaNsFromTag(final @Nullable XmlTag xmlTag)