[Haskell-cafe] a now abandoned experimental extension to Haskell?

[Vasili I. Galchin]

Hello,

    In some code that I am cabalizing I ran into:

    type DataLiteral  = <<< ref RDFgraph defs >>>
    type URIReference = <<< ref RDFgraph defs >>>
    type NonNegativeInteger = <<< ??? >>>

What is this?

Kind regards,

Vasili
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