Macro ebay::ebay_xml_element

macro_rules! ebay_xml_element {
    (
    ATTRS $e:expr, [
      $($attr_name:ident = $attr_value:expr),*
    ]
  ) => { ... };
    (
    CHILDREN $e:expr, [
      $($tag_name:ident $attrs:tt $children:tt)*
    ]
  ) => { ... };
    (
    CHILDREN $e:expr, [
      $text:expr
    ]
  ) => { ... };
    (
    $tag_name:ident $attrs:tt $children:tt
  ) => { ... };
}