iri: implementation in turtle doc

but slow!

examples/turtle_doc/input/0029.ttl

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+@base <http://example.org/> .
+
+# Define prefixes for namespaces (optional but common practice)
+@prefix ex: <http://example.org/ns#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+
+# Relative IRIs resolve against the base
+<about> a foaf:Document ;
+    foaf:title "An Example Document" ;
+    foaf:maker <people/john-doe> .
+
+# Use a prefix to reference another IRI
+ex:item123 a ex:Product ;
+    ex:price "19.99"^^<http://www.w3.org/2001/XMLSchema#decimal> ;
+    ex:availableAt <store> .
+
+# Fully qualified IRIs are unaffected by the base
+<http://another.example.org/resource> ex:relatedTo ex:item123 .

examples/turtle_doc/output/0029.ttl

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+
+<http://example.org/about> a <http://xmlns.com/foaf/0.1/Document> ;
+    <http://xmlns.com/foaf/0.1/title> "An Example Document" ;
+    <http://xmlns.com/foaf/0.1/maker> <http://example.org/people/john-doe> .
+
+<http://example.org/ns#item123> a <http://example.org/ns#Product> ;
+    <http://example.org/ns#price> "19.99"^^<http://www.w3.org/2001/XMLSchema#decimal> ;
+    <http://example.org/ns#availableAt> <http://example.org/store> .
+
+<http://another.example.org/resource> <http://example.org/ns#relatedTo> <http://example.org/ns#item123> .