Node layer attribute not implemented in OpenCollada?

I was about to implement support for importing Node Layers into Blender. According to the Collada specification a Node has 5 optional attributes:

`id xs:ID`
`name xs:NCName`
`sid xs:NCName`
`type NodeType`
`layer ListOfNames`

The Layer attribute seems to be missing in OpenCollada. So if we have a dae file that contains layer information, Is there a workaround that allows us to access the original data that was used to create the Node element and extract the layer attribute from there?

The issue names no source file, test, or parser entry point; begin by locating OpenCOLLADA's Node element parsing and model code and comparing it with the listed COLLADA attributes. Done means layer values from a .dae Node are preserved and exposed so Blender can access them, with coverage for a layered Node if relevant tests exist.

Written by the indexing model from the issue text.