class Lutaml::Model::Xml::XmlElement

def find_children_by_name(name) 

def find_children_by_name(name)
  if name.is_a?(Array)
    children.select { |child| name.include?(child.namespaced_name) }
  else
    children.select { |child| child.namespaced_name == name }
  end
end