Creating orders in hybris from external system through data hub

Greetings!

I'm new to hybris. I've completed a tutorial regarding data modeling through a data hub extension:

https://wiki.hybris.com/display/R5T/hybris+5+Developer+Training+Trail+-+Data+Modeling+through+a+Data+Hub+Extension+-+Step+2

I want to import orders from other system into hybris, but one thing isn't clear to me. The target data has to be something that hybris understand. I can't figure out what the xml for hybris order should look like. For example below is the XML for categories.

Any help will be much appreciated!

Regards, Plamen

         <targetItems>
             <item>
                 <type>ApparelCategory</type>
                 <exportCode>Category</exportCode>
                 <description>Hybris Platform representation of an apparel product category</description>
                 <updatable>true</updatable>
                 <canonicalItemSource>CanonicalApparelCategory</canonicalItemSource>
                 <status>ACTIVE</status>
                <attributes>
                     <attribute>
                         <name>code</name>
                         <localizable>false</localizable>
                         <collection>false</collection>
                         <transformationExpression>integrationKey</transformationExpression>
                         <exportCode>code[unique=true]</exportCode>
                         <mandatoryInHeader>true</mandatoryInHeader>
                     </attribute>
                     <attribute>
                         <name>name</name>
                         <localizable>true</localizable>
                         <collection>false</collection>
                         <transformationExpression>name</transformationExpression>
                         <exportCode>name</exportCode>
                         <mandatoryInHeader>false</mandatoryInHeader>
                     </attribute>
                      <attribute>
                         <name>superCategories</name>
                         <localizable>false</localizable>
                         <collection>true</collection>
                         <transformationExpression>parentCategories</transformationExpression>
                         <exportCode>superCategories(code,$catalogVersion)</exportCode>
                         <mandatoryInHeader>false</mandatoryInHeader>
                     </attribute>
                     <attribute>
                         <name>catalogVersion</name>
                         <localizable>false</localizable>
                         <collection>false</collection>
                         <transformationExpression>""</transformationExpression>
                         <exportCode>$catalogVersion</exportCode>
                         <mandatoryInHeader>true</mandatoryInHeader>
                     </attribute>
                 </attributes>
             </item>
         </targetItems>