- added rule to express that either a stream should not exist or exist with...

- added rule to express that either a stream should not exist or exist with given properties to all film-profiles

HINTS

@@ -2,6 +2,8 @@ the policy format of mediaconch is not well documented yet, here some observatio
 (date: 2017-02-20)
 
 - within the policy-xml there are no XML-comments allowed 
+  (will be fixed in upcoming mediaconch version)
+
 - tag <description /> is only allowed on top level, otherwise it will be
   interpreted as a rule with value "true". This could affect the result if next
   real rule fails. Example:
@@ -10,15 +12,18 @@ real rule fails. Example:
     <rule name="bar" value="baz" tracktype="General" occurrence="*" operator="=">1</rule>
   </policy>
   will always "true", also if <rule name="bar" .. /> fails.
-- there is no way to express an "optional depends". This means you can't
-  express a rule like "Either Audio or not, but if Audio it must be a FLAC"
-
 
+- to express that either a stream should not exist or exist with given properties, try this:
+  <policy type="or" name="Audio">
+    <rule name="Audio does not exist" value="Default" tracktype="Audio" occurrence="*" operator="must not exist"/>
+    <policy type="or" name="Audio exist">
+      ... <!-- here to check given audio properties -->
+    </policy>
+  </policy>
 
 Expected video-sizes:
 - a good source about videosizes could be https://de.wikipedia.org/wiki/Digital_Intermediate
 
-
 Preservation policy for video material of SLUB:
 - there is no policy offically released yet, please be patient… :)
 
@@ -26,3 +31,4 @@ Howto check files against policy:
 - you need an installed mediaconch
 - on Bash call:
   $> mediaconch --Policy=SLUB_mediaconch_policy_retrodigitized_film35mm.xml -fh file-to-test.mkv > report.html
+

SLUB_mediaconch_policy_retrodigitized_film16mm.xml

@@ -42,6 +42,8 @@
     </policy>
     
     <policy type="or" name="Audio">
+      <rule name="Audio does not exist" value="Default" tracktype="Audio" occurrence="*" operator="must not exist"/>
+      <policy type="or" name="Audio exist">
         <rule name="General/AudioCount is 1" value="AudioCount" tracktype="General" occurrence="*" operator="=">1</rule>
         <policy type="or" name="Audio is PCM or FLAC">
           <rule name="Audio is PCM" value="Format" tracktype="Audio" occurrence="*" operator="=">PCM</rule>
@@ -59,3 +61,4 @@
       </policy>
     </policy>
   </policy>
+</policy>

SLUB_mediaconch_policy_retrodigitized_film35mm.xml

@@ -49,6 +49,8 @@
     </policy>
     
     <policy type="or" name="Audio">
+      <rule name="Audio does not exist" value="Default" tracktype="Audio" occurrence="*" operator="must not exist"/>
+      <policy type="or" name="Audio exist">
         <rule name="General/AudioCount is 1" value="AudioCount" tracktype="General" occurrence="*" operator="=">1</rule>
         <policy type="or" name="Audio is PCM or FLAC">
           <rule name="Audio is PCM" value="Format" tracktype="Audio" occurrence="*" operator="=">PCM</rule>
@@ -66,3 +68,4 @@
       </policy>
     </policy>
   </policy>
+</policy>

SLUB_mediaconch_policy_retrodigitized_film8mm.xml

@@ -49,6 +49,8 @@
     </policy>
 
     <policy type="or" name="Audio">
+      <rule name="Audio does not exist" value="Default" tracktype="Audio" occurrence="*" operator="must not exist"/>
+      <policy type="or" name="Audio exist">
         <rule name="General/AudioCount is 1" value="AudioCount" tracktype="General" occurrence="*" operator="=">1</rule>
         <policy type="or" name="Audio is PCM or FLAC">
           <rule name="Audio is PCM" value="Format" tracktype="Audio" occurrence="*" operator="=">PCM</rule>
@@ -66,3 +68,4 @@
       </policy>
     </policy>
   </policy>
+</policy>