Cylinder parameters: elements or attributes

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In the cylinder SDF specification, the radius and length of a cylinder are children elements, as the example in that website shows:

<cylinder>
    <radius>1</radius>
    <length>1.2</length>
 </cylinder>

However, in Gazebo5 this throws the error:

[ERROR] [1457697849.467197389]: Cylinder shape must have both length and radius attributes

Therefore, it looks like Gazebo 5 requires those values as attributes:

<geometry>
    <cylinder length="1.2" radius="1"/>
</geometry>

And this works OK. Which one is correct? Is it a Gazebo bug?