<item name="НКТ">
          <items>

            <item name="Характеристика НКТ" type="Modem.WellMart.LookupWorkItem, Modem.WellMart">
               <parameters>
                  <item key="schema" value="Reference\Tubing.xml"/>
               </parameters>
            </item>

(....................)            
          </items>
 </item>

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="TubingType"
           targetNamespace="http://schemas.modem.by/TubingType.xml"
           xmlns="http://schemas.modem.by/TubingType.xml"
           xmlns:mstns="http://schemas.modem.by/TubingType.xml"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"
           xmlns:msprop="urn:schemas-microsoft-com:xml-msprop"
           attributeFormDefault="qualified"
           elementFormDefault="qualified">

  <xs:include schemaLocation="..\ReferenceTables.xml"/>

  <xs:element name="TubingTypeDataSet" msdata:UseCurrentLocale="true"
              msdata:IsDataSet="true">
    <xs:complexType>
      <xs:choice minOccurs="0" maxOccurs="unbounded">

        <!-- Справочник типов НКТ -->
        <xs:element name="TubingType" type="ctIdName" msprop:OrderBy="Name"
                    msprop:DBName="REF_TUBING_TYPE" />
      </xs:choice>
    </xs:complexType>   
</xs:schema>