I'm pretty sure the LD construct 'diaspora:guid' isn't actually legal without a definition of 'diaspora' in the current or parent LD context.

Zotlabs/Module/Apschema.php

@@ -41,8 +41,11 @@ class Apschema extends \Zotlabs\Web\Controller {
 				],
 
 				'ostatus'      => 'http://ostatus.org#',
-				'conversation' => 'ostatus:conversation'
+				'conversation' => 'ostatus:conversation',
 
+				'diaspora'     => 'https://diasporafoundation.org/ns/',
+				'guid'         => 'diaspora:guid'
+				
 			]
 		];
 

boot.php

@@ -468,7 +468,7 @@ define ( 'NAMESPACE_YMEDIA',          'http://search.yahoo.com/mrss/' );
 
 define ( 'ACTIVITYSTREAMS_JSONLD_REV', 'https://www.w3.org/ns/activitystreams' );
 
-define ( 'ZOT_APSCHEMA_REV', '/apschema/v1.6' );
+define ( 'ZOT_APSCHEMA_REV', '/apschema/v1.7' );
 /**
  * activity stream defines
  */