Context Object - possible inconsistency with specification #79
Description
The xAPI specification's description of the properties of the Context Object (see https://github.com/adlnet/xAPI-Spec/blob/master/xAPI-Data.md#requirements-10) is as follows:
- The "revision" property MUST only be used if the Statement's Object is an Activity.
- The "platform" property MUST only be used if the Statement's Object is an Activity.
In apparent contravention of the specification the PHP xAPI library allows the 'revision' and 'platform' properties where the Statement's Object is other than Activity. Example:
$activity = new TinCan\Activity (
[
'id' => 'http://www.baileyandireland.com/tincan/meeting/16-10-16',
'objectType' => 'Agent',
'name' => 'Andrew Downes',
'mbox' => 'mailto:andrew@example.co.uk'
]
);
$context = new TinCan\Context (
[
'registration' => 'ec531277-b57b-4c15-8d91-d292c5b2b8f7',
'instructor' =>
[
'name' => 'Andrew Downes',
'account' =>
[
'homePage' => 'http://www.example.com',
'name' => '13936749'
],
'objectType' => 'Agent'
],
'team' =>
[
'name' => 'Team PB',
'mbox' => 'mailto:teampb@example.com',
'objectType' => 'Group'
],
'contextActivities' =>
[
'parent' =>
[
'id' => 'http://www.example.com/meetings/series/267',
'objectType' => 'Activity'
],
'grouping' =>
[
'id' => 'http://example.adlnet.gov/xapi/example/Algebra1'
],
'category' =>
[
'id' => 'http://www.example.com/meetings/categories/teammeeting',
'objectType' => 'Activity',
'definition' =>
[
'name' =>
[
'en-US' => 'team meeting'
],
'description' =>
[
'en-US' => 'A category of meeting used for regular team meetings.'
],
'type' => 'http://example.com/expapi/activities/meetingcategory'
],
],
'other' =>
[
[
'id' => 'http://www.example.com/meetings/occurances/34257',
'objectType' => 'Activity'
],
[
'id' => 'http://www.example.com/meetings/occurances/3425567',
'objectType' => 'Activity'
]
]
],
'revision' => 'Updated in Dec 2015',
'platform' => 'Example virtual meeting software',
'language' => 'en',
'statement' =>
[
'objectType' => 'StatementRef',
'id' => '6690e6c9-3ef0-4ed3-8b37-7f3964730bee'
],
'extensions' =>
[
'http://example.com/profiles/meetings/activitydefinitionextensions/room' =>
[
'name' => 'Kilby',
'id' => 'http://example.com/rooms/342'
]
]
]
);