Reuse the same rdf:type node for all "a" abbreviations

This reduces the stack space requirements for every type statement, at the cost
of adding a bit of constant bloat for the node in documents that do not contain
it.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/reader.h b/src/reader.h
index 0bb3454b..9ec2e4ac 100644
--- a/src/reader.h
+++ b/src/reader.h
@@ -40,6 +40,7 @@ struct SerdReaderImpl {
   SerdNode*       rdf_first;
   SerdNode*       rdf_rest;
   SerdNode*       rdf_nil;
+  SerdNode*       rdf_type;
   SerdByteSource* source;
   SerdEnv*        env;
   SerdStack       stack;