From a1f83aaba3db3b20f09b4dbb0ca1f4bf897b4db9 Mon Sep 17 00:00:00 2001
From: Dave Longley <dlongley@digitalbazaar.com>
Date: Mon, 21 May 2012 15:51:17 -0400
Subject: [PATCH] Fix blank node check in _flatten.

---
 jsonld.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/jsonld.php b/jsonld.php
index 3d9b004..7aa9426 100644
--- a/jsonld.php
+++ b/jsonld.php
@@ -2365,8 +2365,8 @@ class JsonLdProcessor {
           // handle embedded subject or subject reference
           if(self::_isSubject($o) || self::_isSubjectReference($o)) {
             // rename blank node @id
-            $id = property_exists($o, '@id') ? $o->{'@id'} : '_:';
-            if(strpos($id, '_:') === 0) {
+            $id = property_exists($o, '@id') ? $o->{'@id'} : null;
+            if(self::_isBlankNode($o)) {
               $id = $namer->getName($id);
             }