From 6e732f5731913af35457dd9f0a17f1e33c648c8e Mon Sep 17 00:00:00 2001
From: Dave Longley <dlongley@digitalbazaar.com>
Date: Wed, 3 Apr 2013 17:33:17 -0400
Subject: [PATCH] Ensure inverse context isn't regenerated unnecessarily.

---
 jsonld.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/jsonld.php b/jsonld.php
index 7e4b000..05b9699 100644
--- a/jsonld.php
+++ b/jsonld.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * PHP implementation of the JSON-LD API.
- * Version: 0.0.20
+ * Version: 0.0.21
  *
  * @author Dave Longley
  *
@@ -4850,6 +4850,11 @@ class JsonLdProcessor {
    * @return stdClass the inverse context.
    */
   protected function _getInverseContext($active_ctx) {
+    // inverse context already generated
+    if($active_ctx->inverse) {
+      return $active_ctx->inverse;
+    }
+
     $inverse = $active_ctx->inverse = new stdClass();
 
     // handle default language