1 files changed, 27 insertions, 0 deletions
diff --git a/include/serd/serd.h b/include/serd/serd.h
index efa48543..fad9d070 100644
--- a/include/serd/serd.h
+++ b/include/serd/serd.h
@@ -217,6 +217,7 @@ typedef enum {
   SERD_ERR_BAD_CALL,   ///< Invalid call
   SERD_ERR_BAD_URI,    ///< Invalid or unresolved URI
   SERD_ERR_BAD_INDEX,  ///< No optimal model index available
+  SERD_ERR_INVALID,    ///< Invalid data
 } SerdStatus;
 
 /**
@@ -1939,6 +1940,32 @@ serd_sink_write_end(const SerdSink* SERD_NONNULL sink,
 
 /**
    @}
+   @defgroup serd_canon Canon
+   @{
+*/
+
+/// Flags that control canonical node transformation
+typedef enum {
+  SERD_CANON_LAX = 1u << 0u, ///< Tolerate and pass through invalid input
+} SerdCanonFlag;
+
+/// Bitwise OR of SerdCanonFlag values
+typedef uint32_t SerdCanonFlags;
+
+/**
+   Return a new sink that transforms literals to canonical form where possible.
+
+   The returned sink acts like `target` in all respects, except literal nodes
+   in statements may be modified from the original.
+*/
+SERD_API
+SerdSink* SERD_ALLOCATED
+serd_canon_new(const SerdWorld* SERD_NULLABLE world,
+               const SerdSink* SERD_NONNULL   target,
+               SerdCanonFlags                 flags);
+
+/**
+   @}
    @defgroup serd_env Environment
    @{
 */