Multiple instances are generated when using additional nodes within domain elements

[ymark]

When an additional node is declared inside a domain node then multiple instances of the entity declared inside the additional node are generated. For example the following part of the x3ml mappings file

<domain>
   <source_node>//COIN</source_node>
   <target_node>
      <entity>
         <type>crm:E22_Man-Made_Object</type>
         <instance_generator name="UUID"/>
         <additional>
            <relationship>crm:PX1_is_made_of</relationship>
            <entity>
               <type>crm:EX1_Material</type>
                  <instance_generator name="UUID"/>
            </entity>
         </additional>
      </entity>
   </target_node>
</domain>

will create 2 instances of the crm:EX1_Material class: the first one properly connected with the corresponding crm:E22_Man-Made_Object and the other one will be orphan (It will not have any incoming properties).

[ymark]

This issue has been raised because domain nodes where resolved twice.
Added an extra check so if a domain has already been resolved, it will not happen again.

The bug-free version of the X3ML Engine will be made available starting from version 1.7.5