Opaque
Question types ::: qtype_opaque
Maintained by 
Tim Hunt
This question type uses web services to connect to other question engines like OpenMark or ounit, so that their questions can be used in a Moodle quiz.
Latest release:
157 sites
186 downloads
6 fans
Current versions available: 7
Opaque (http://docs.moodle.org/en/Development:Opaque) is the Open protocol for
accessing question engines. It can be used to add questions to a Moodle quiz from third party assessment systems that support the protocol, like OpenMark or ounit (http://code.google.com/p/ounit/) and possibly other question systems we don't know about.
As well as this question type, you aslo need the associated question behaviour https://moodle.org/plugins/qbehaviour_opaque.
Sets
This plugin is part of set Open University.
Screenshots
Contributors
Tim Hunt (Lead maintainer)
Chris Nelson: Product owner
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Comments 
Comments
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CAS failed to return any data. ans1:3*(x-1)^2
I decided to run the healthcheck.php script. This script showed all information without any error message.
Any idea?
TIA
Monico
CAS failed to return any data. ans1: 3*(x-1)^2
After I checked it out, it was the maxima CAS version installed on the server. I updated on the Stack configuration and it is working.
Cheers
Mónico
When trying to create an Opaque question, while using Developer debug mode, the form does not appear, instead a Strict Standards error message appears, about a non-existent HTML element (questiontext and generalfeedback). At the upgrade.txt of question/type (https://github.com/moodle/moodle/blob/master/question/type/upgrade.txt), at the = 2.3 = section it states:
" If you are overriding export_to_xml and import_from_xml to provide Moodle XML format
import and export, then you will probably get PHP strict syntax notices in developer
debug mode until you change the method signature to include qformat_xml $format.
That is, you need to specify the argument type."
After correcting the argument type at question/type/opaque/questiontype.php as above, the new opaque question form still doesn't appear. Instead, an error occurs starting with:
"QuickForm Error: nonexistent html element Element 'questiontext' does not exist in HTML_QuickForm::getElement()"
and ending:
"Fatal error: Call to undefined method HTML_QuickForm_Error::getValue() in [...]moodle/question/type/edit_question_form.php on line 441 "
As a quick solution, I've tried editing edit_opaque_form.php, by commenting out this part:
$mform->removeElement('questiontext');
$mform->removeElement('generalfeedback');
That does the trick (the form appears and an Opaque question can be created) but I don't like the idea of such a solution and I think it's causing other problems to the Opaque engine communication.
Any ideas/proposals?
Thank you
My colleague installed it some days ago through git so I suppose it's the latest version. Nevertheless, I tried to reinstall it, in case it was outdated, but when trying to uninstall Opaque, there's this error:
"You cannot delete the question type 'Opaque'. There are other question types installed that rely on it."
(however, no qtypes seem to be associated)
And when trying to uninstall opaque behaviour, there's that error:
"You cannot delete the behaviour 'Question managed by a remote engine'. It is used by question attempts."
If it matters at all, Moodle version.php:
$version = 2012062504.06;
$release = '2.3.4+ (Build: 20130214)';
After fighting with the installation of opaque + testing it into moodle 2.5 with testopaque and openmark...
(BTW, openmark works only with tomcat6, not 7)
it keeps answering : "Unexpected question state."
So, I made another install of moodle (2.3), and know it does work fine...
Is the problem come from the test programs, or change in moodle behaviour, or opaque ?
Thanks in advance,
Gabriel
We have been developing some new question types while using your Opaque plugin.
It works very fine without overloading the Moodle question type list.
Many thanks for this plugin.
But we have been testing a Moodle 3.5.1+ upgrade and we encounter an error on line 135 of connection.php with the extends_soapclient function that evolved in php7.
It seems to be a touchy question in php community so that we hope you will have some time to have a look at
Great thanks for your contributions to the Moodle community ;-*
Zabelle
This plugin is not refered to be mandatory for Moodle but must be installed for your plugin to work.
Kisses
Zabelle
qbehaviour_opaque, 2.8 For Moodle 3.4+, 2018081400
Moodle version 3.6
Need help