vba - Generating XML file out of Excel with 50k rows -

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i new vba. know other programming languages little. interested know, how transfer table below new structure efficient way. in total there 50k rows of data process , need know approach work given amount of data.

excel:

 level   key     value                   reference  1       k_1     fruit    1       k_2     vegetable    2       k_1_1   banana                  k_1 2       k_1_2   apple                   k_1 2       k_2_1   cucumber                k_2 2       k_2_2   carrot                  k_2 3       k_1_1_1 banana        k_1_1 3       k_1_1_2 banana else   k_1_1 3       k_1_1_3 banana else   k_1_1 3       k_1_1_4 banana else   k_1_1 3       k_1_1_5 banana else   k_1_1

the resulting structure should group types, subtypes , subsubtypes according structure below:

<type key="k_1">     <levelid>1</levelid>     <value>fruit</value>     <subtype key="k_1_1">         <levelid>2</levelid>         <value>banana</value>         <subsubtype key="k_1_1_1">             <levelid>3</levelid>             <value>banana something</value>         </subsubtype>         <subsubtype key="k_1_1_2">             <levelid>3</levelid>             <value>banana else</value>         </subsubtype>     </subtype>     <subtype key="k_1_2">         <levelid>2</levelid>         <value>apple</value>         <subsubtype key="k_1_1_1">             <levelid>3</levelid>             <value>apple something</value>         </subsubtype>         <subsubtype key="k_1_1_2">             <levelid>3</levelid>             <value>apple else</value>         </subsubtype>     </subtype> </type>

the biggest challenge me handle amount of data efficient way.


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