==================
Root attribute
==================
direction: value

---

(source_file
  (attr_key) (attr_value)
)

==================
Inline shape attribute
==================
foo.shape: oval
foo.bar.baz.shape: oval

---

(source_file
  (shape (identifier) (dot) (attr_key) (attr_value))
  (shape (identifier) (dot) (identifier) (dot) (identifier) (dot) (attr_key) (attr_value))
)

==================
Inline style attribute
==================
foo.style.opacity: 5

---

(source_file
  (shape (identifier) (dot) (attr_key) (dot) (attr_key) (attr_value))
)