1 files changed, 8 insertions, 9 deletions

diff --git a/src/writer.c b/src/writer.c
index 0fabb7af..4f4a76df 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -502,15 +502,13 @@ write_literal(SerdWriter*        writer,
   const char*     node_str = serd_node_string(node);
   const char*     type_uri = datatype ? serd_node_string(datatype) : NULL;
   if (supports_abbrev(writer) && type_uri) {
-    if (!strncmp(type_uri, NS_XSD, sizeof(NS_XSD) - 1) &&
-        (!strcmp(type_uri + sizeof(NS_XSD) - 1, "boolean") ||
-         !strcmp(type_uri + sizeof(NS_XSD) - 1, "integer"))) {
+    if (serd_node_equals(datatype, writer->world->xsd_boolean) ||
+        serd_node_equals(datatype, writer->world->xsd_integer)) {
       sink(node_str, node->n_bytes, writer);
       return true;
     }
 
-    if (!strncmp(type_uri, NS_XSD, sizeof(NS_XSD) - 1) &&
-        !strcmp(type_uri + sizeof(NS_XSD) - 1, "decimal") &&
+    if (serd_node_equals(datatype, writer->world->xsd_decimal) &&
         strchr(node_str, '.') && node_str[node->n_bytes - 1] != '.') {
       /* xsd:decimal literals without trailing digits, e.g. "5.", can
          not be written bare in Turtle.  We could add a 0 which is
@@ -573,11 +571,12 @@ write_uri_node(SerdWriter* const        writer,
   const char* node_str   = serd_node_string(node);
   const bool  has_scheme = serd_uri_string_has_scheme(node_str);
   if (supports_abbrev(writer)) {
-    if (field == SERD_PREDICATE && !strcmp(node_str, NS_RDF "type")) {
+    if (field == SERD_PREDICATE &&
+        serd_node_equals(node, writer->world->rdf_type)) {
       return sink("a", 1, writer) == 1;
     }
 
-    if (!strcmp(node_str, NS_RDF "nil")) {
+    if (serd_node_equals(node, writer->world->rdf_type)) {
       return sink("()", 2, writer) == 2;
     }
 
@@ -760,13 +759,13 @@ write_list_obj(SerdWriter*        writer,
                const SerdNode*    predicate,
                const SerdNode*    object)
 {
-  if (!strcmp(serd_node_string(object), NS_RDF "nil")) {
+  if (serd_node_equals(object, writer->world->rdf_nil)) {
     --writer->indent;
     write_sep(writer, SEP_LIST_END);
     return true;
   }
 
-  if (!strcmp(serd_node_string(predicate), NS_RDF "first")) {
+  if (serd_node_equals(predicate, writer->world->rdf_first)) {
     write_sep(writer, SEP_LIST_SEP);
     write_node(writer, object, SERD_OBJECT, flags);
   }