From d549a93b91b99dabd073759cd8fd958e6eb5b3de Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Fri, 18 Oct 2019 21:47:14 +0200
Subject: Normalise away rdf:langString datatype

Depending on how you read the specifications, a rdf:langString isn't identical
to an xsd:string, but an rdf:langString must have a non-empty language tag so
having this datatype doesn't really make any sense anyway.
---
 src/normalise.c                    | 2 ++
 tests/normalise/test-normalise.nt  | 1 +
 tests/normalise/test-normalise.ttl | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/src/normalise.c b/src/normalise.c
index 34f97f71..bdf6d871 100644
--- a/src/normalise.c
+++ b/src/normalise.c
@@ -217,6 +217,8 @@ serd_node_normalise(const SerdEnv* env, const SerdNode* const node)
 	                   INTEGER_TYPE_LEN,
 	                   (int (*)(const void*, const void*))strcmp)) {
 		result = serd_normalise_integer(str, datatype);
+	} else if (!strcmp(datatype_uri, NS_RDF "langString")) {
+		result = serd_new_string(serd_node_string(node));
 	}
 
 	serd_node_free(datatype);
diff --git a/tests/normalise/test-normalise.nt b/tests/normalise/test-normalise.nt
index e23989ec..d2eff5a2 100644
--- a/tests/normalise/test-normalise.nt
+++ b/tests/normalise/test-normalise.nt
@@ -63,6 +63,7 @@ _:b1 <http://example.org/integer> "0"^^<http://www.w3.org/2001/XMLSchema#nonNega
 _:b1 <http://example.org/integer> "36893488147419103232"^^<http://www.w3.org/2001/XMLSchema#nonNegativeInteger> .
 _:b1 <http://example.org/integer> "1"^^<http://www.w3.org/2001/XMLSchema#positiveInteger> .
 _:b1 <http://example.org/integer> "36893488147419103232"^^<http://www.w3.org/2001/XMLSchema#positiveInteger> .
+_:b1 <http://example.org/langString> "no language tag" .
 _:b1 <http://example.org/other> "untyped" .
 _:b1 <http://example.org/other> <http://example.org/uri> .
 _:b1 <http://example.org/other> "notxsd"^^<http://example.org/sometype> .
diff --git a/tests/normalise/test-normalise.ttl b/tests/normalise/test-normalise.ttl
index 3db64f39..85dd2456 100644
--- a/tests/normalise/test-normalise.ttl
+++ b/tests/normalise/test-normalise.ttl
@@ -1,4 +1,5 @@
 @base <http://example.org/> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 
 [
@@ -67,6 +68,7 @@
 		" 036893488147419103232 "^^xsd:nonNegativeInteger ,
 		" +01 "^^xsd:positiveInteger ,
 		" 036893488147419103232 "^^xsd:positiveInteger ;
+	<langString> "no language tag"^^rdf:langString ;
 	<other> "untyped" ,
 		<uri> ,
 		"notxsd"^^<sometype> ,
-- 
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