{- |

Module : $Header$

Copyright : (c) Felix Gabriel Mance, Francisc-Nicolae Bungiu

License : GPLv2 or higher, see LICENSE.txt

Maintainer : Christian.Maeder@dfki.de

Stability : provisional

Portability : portable

RDF abstract syntax

References:

<http://www.w3.org/TeamSubmission/turtle/>

<http://www.informatik.uni-bremen.de/~till/papers/ontotrans.pdf>

<http://www.w3.org/TR/rdf-concepts/#section-Graph-syntax>

-}

module RDF.AS where

import Common.Id

import OWL2.AS

import qualified Data.Map as Map

-- * Graphs

data Subject =

Subject IRI

| SubjectList PredicateObjectList

| SubjectCollection [Object]

deriving (Show, Eq, Ord)

data Predicate = Predicate IRI

deriving (Show, Eq, Ord)

data Object =

Object IRI

| ObjectList PredicateObjectList

| ObjectCollection [Object]

| ObjectLiteral Literal

deriving (Show, Eq, Ord)

{- | Triples can also be abbreviated using a comma (subject and predicate stay

the same) or using a semicolon (subject stays the same) -}

data Triples = Triples Subject PredicateObjectList

deriving (Show, Eq, Ord)

data PredicateObjectList = PredicateObjectList Predicate [Object]

deriving (Show, Eq, Ord)

data BaseIRI = BaseIRI IRI

deriving (Show, Eq, Ord)

data Prefix = Prefix String IRI

deriving (Show, Eq, Ord)

type TurtlePrefixMap = Map.Map String IRI

data Axiom = Axiom Subject Predicate Object

deriving (Show, Eq, Ord)

data TurtleDocument = TurtleDocument [(Triples, BaseIRI, TurtlePrefixMap)]

deriving (Show, Eq, Ord)

data RDFEntityType = SubjectEntity | PredicateEntity | ObjectEntity

deriving (Show, Eq, Ord, Bounded, Enum)

-- | entities used for morphisms

data RDFEntity = RDFEntity RDFEntityType IRI

deriving (Show, Eq, Ord)

rdfEntityTypes :: [RDFEntityType]

rdfEntityTypes = [minBound .. maxBound]

instance GetRange TurtleDocument where

instance GetRange Axiom where

instance GetRange RDFEntity where