Completed content/media types

README.md

@@ -31,8 +31,8 @@ $problem['accounts'] = array(
 $json_string = $problem->asJson();
 
 // Now send that JSON string as a response along with the appropriate HTTP error
-// code and content type which is available via ApiProblem::CONTENT_TYPE.
-// Also check out asXml() for the angle-bracket fans in the room.
+// code and content type which is available via ApiProblem::CONTENT_TYPE_JSON.
+// Also check out asXml() and ApiProblem::CONTENT_TYPE_XML for the angle-bracket fans in the room.
 
 ```
 

src/ApiProblem.php

@@ -39,12 +39,20 @@ class ApiProblem implements \ArrayAccess
 {
 
     /**
-     * The content type for a HTTP response carrying
+     * The content type for a JSON based HTTP response carrying
      * problem details.
      *
      * @var string
      */
-    const CONTENT_TYPE = 'application/problem+json';
+    const CONTENT_TYPE_JSON = 'application/problem+json';
+
+    /**
+     * The content type for a XML based HTTP response carrying
+     * problem details.
+     *
+     * @var string
+     */
+    const CONTENT_TYPE_XML = 'application/problem+xml';
 
     /**
      *  A short, human-readable summary of the problem type.

tests/ApiProblemTest.php

@@ -32,7 +32,8 @@ public function testConstructor()
 
     public function testContentType()
     {
-        $this->assertEquals('application/problem+json', ApiProblem::CONTENT_TYPE);
+        $this->assertEquals('application/problem+json', ApiProblem::CONTENT_TYPE_JSON);
+        $this->assertEquals('application/problem+xml', ApiProblem::CONTENT_TYPE_XML);
     }
 
     public function testSimpleExtraProperty()