How to handle missing attributes in lists with xquery

Building an xml with XMLTemplater transformer, some attributes are lists where some element may not exist.

For example, I have contact information for 3 organizations and some may not have an individual name:

contact{0}.CI_ResponsibleParty.organisationName.CharacterString

 

contact{0}.CI_ResponsibleParty.individualName.CharacterString

 

contact{0}.CI_ResponsibleParty.contactInfo.CI_Contact.phone.CI_Telephone.voice.CharacterString

 

contact{1}.CI_ResponsibleParty.organisationName.CharacterString

 

contact{1}.CI_ResponsibleParty.contactInfo.CI_Contact.phone.CI_Telephone.voice.CharacterString

 

contact{2}.CI_ResponsibleParty.organisationName.CharacterString

 

contact{2}.CI_ResponsibleParty.individualName.CharacterString

 

contact{2}.CI_ResponsibleParty.contactInfo.CI_Contact.phone.CI_Telephone.voice.CharacterString

 

To populate the xml with a contact block for each organization I do this:

{

 

let $individualName := fme:get-list-attribute("contact{}.CI_ResponsibleParty.individualName.CharacterString")

 

let $voice := fme:get-list-attribute("contact{}.CI_ResponsibleParty.contactInfo.CI_Contact.phone.CI_Telephone.voice.CharacterString")

 

for $organisationName at $i in fme:get-list-attribute("contact{}.CI_ResponsibleParty.organisationName.CharacterString")

 

return

 

<gmd:contact>

 

<gmd:CI_ResponsibleParty>

 

<gmd:individualName>

 

<gco:CharacterString>{$individualName[$i]}</gco:CharacterString>

 

</gmd:individualName>

 

<gmd:organisationName>

 

<gco:CharacterString>{$organizationName[$i]}</gco:CharacterString>

 

</gmd:organisationName>

 

<gmd:contactInfo>

 

<gmd:CI_Contact>

 

<gmd:phone>

 

<gmd:CI_Telephone>

 

<gmd:voice>

 

<gco:CharacterString>{$voice[$i]}</gco:CharacterString>

 

</gmd:voice>

 

</gmd:CI_Telephone>

 

</gmd:phone>

 

</gmd:CI_Contact>

 

</gmd:contactInfo>

 

</gmd:CI_ResponsibleParty>

 

</gmd:contact>

 

}

But $individualName is empty if any element in the list is missing so no organization gets the contact\\CI_ResponsibleParty\\individualName\\CharacterString node populated.

Any idea?

There's a NullAttributeMapper transformer to map missing attributes but I have many lists with multiple elements (some of them are nested lists) so I'll need quite a bunch of transformers. There must be some other way.