--- /dev/null
+<?php
+
+/*
+ * This file is part of the JsonSchema package.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace JsonSchema;
+
+/**
+ * @package JsonSchema
+ */
+interface UriResolverInterface
+{
+ /**
+ * Resolves a URI
+ *
+ * @param string $uri Absolute or relative
+ * @param null|string $baseUri Optional base URI
+ *
+ * @return string Absolute URI
+ */
+ public function resolve($uri, $baseUri = null);
+}