def response
id = @a[0]
opts = @a[1]
doc = XML::Smart::open_unprotected(opts[:properties_empty])
doc.register_namespace 'p', 'http://cpee.org/ns/properties/2.0'
des = doc.find("/p:properties/p:positions").first
CPEE::Persistence::extract_set(id,opts,'positions').each do |de|
node = des.add(*de)
if pt = CPEE::Persistence::extract_item(id,opts,File.join('positions',de[0],'@passthrough'))
node.attributes['passthrough'] = pt
end
end
Riddl::Parameter::Complex.new('positions','text/xml',des.to_doc.to_s)
end