Merge pull request #3 from andreassolberg/fix/trust-mark-delegation-exp-validation

Fix Trust Mark Delegation validation to handle optional exp claim

Author: selfissued

openid-federation-1_1.xml

@@ -3571,7 +3571,8 @@
                 in the delegation.</t>
             <t>The current time MUST be after the time represented by the iat (issued at) Claim in the delegation
                 (possibly allowing for some small leeway to account for clock skew).</t>
-            <t>The current time MUST be before the time represented by the exp (expiration) Claim in the delegation
+            <t>If the <spanx style="verb">exp</spanx> (expiration) Claim is present in the delegation,
+                the current time MUST be before the time it represents
                 (possibly allowing for some small leeway to account for clock skew).</t>
             <t>
                 The value of the Claim <spanx style="verb">trust_mark_type</spanx> in the delegation MUST be the same