How to insert nodes after specific node of an instance in Orbeon? - orbeon

Question

I have an instance in model:
<Exams>
<ExamCode>14</ExamCode>
</Exams>
<Exams>
<ExamCode>15</ExamCode>
</Exams>
I want to iterate on all elements and add after ExamCode element some nodes but without parent.
My instance after iterate should be like this:
<-- Wanted -->
<Exams>
<ExamCode>14</ExamCode>
<ExamTitle></ExamTitle>
<ExamDescription>/ExamDescription>
</Exams>
<Exams>
<ExamCode>15</ExamCode>
<ExamTitle></ExamTitle>
<ExamDescription></ExamDescription>
</Exams>
What i have tried is this:
Instance to add:
<!-- instance nodes to add-->
<xf:instance id="examRelatedNodes">
<ExamTitle/>
<ExamDescription/>
</xf:instance>
Adding "examRelatedNodes" instance to all repeated Exams nodes:
<!-- insert examRelatedNodes per Exam -->
<xf:action ev:event="xforms-ready" xxf:iterate="instance('fr-form-instance')/Exams">
<xf:insert context="." origin="instance('examRelatedNodes')"/>
</xf:action>
But I get an error that instance to add, should have parent!
I have read the documentation, this from the orbeon blog, but in all paradigms i find, the elements of to-add-instance have a parent, but in my case i don't want to have.Following these examples with parent node, i am able to add them, BUT with parent node "ParentOfExtraNodes" that i don't want:
<-- Not wanted -->
<Exams>
<ExamCode>14</ExamCode>
<ParentOfExtraNodes>
<ExamTitle></ExamTitle>
<ExamDescription>/ExamDescription>
<ParentOfExtraNodes/>
</Exams>
<Exams>
<ExamCode>15</ExamCode>
<ParentOfExtraNodes>
<ExamTitle></ExamTitle>
<ExamDescription>/ExamDescription>
<ParentOfExtraNodes/>
</Exams>
I am using Orbeon Forms 4.5 (XForms implementation).

Answer 1

What you are doing looks about right. But in your instance examRelatedNodes, you need to have a root element, say:
<xf:instance id="examRelatedNodes">
<RelatedNodes>
<ExamTitle/>
<ExamDescription/>
</RelatedNodes>
</xf:instance>
And then your insert will become:
<xf:insert context="." origin="instance('examRelatedNodes')/*"/>