Convert XML elements with extended attributes into CSV

Hi,

  I have a problem trying to convert XML elements with
extended attributes into CSV format.  For example, I
have a XML with the following structure: first part
defines the necessary extended attributes, the second
part has LineItems use both fixed and extend
attributes
<RFQ>
  <RFQExtendAttrDef Domain="line_item"
Code="item_ext1" Name="item_ext1"/>
  <RFQExtendAttrDef Domain="line_item"
Code="item_ext2" Name="item_ext2"/>
  <RFQExtendAttrDef Domain="bid" Code="bid_ext1"
Name="bid_ext1"/>
  <LineItem Name="item1" Category="cat1">
    <ExtendAttr Code="item_ext2" Value="item1 ext2"/>
  </LineItem>
  <LineItem Name="item2" Category="cat1">
    <ExtendAttr Code="item_ext1" Value="item2 ext1"/>
    <ExtendAttr Code="item_ext2" Value="item2 ext2"/>
  </LineItem>
</RFQ>

The resulting CSV I need is:
Domain,Code,Name
line_item,item_ext1,item_ext1
line_item,item_ext2,item_ext2

Name,Category,item_ext1,item_ext2
item1,cat1,,item1 ext2
item2,cat1,item2 ext1,item2 ext2

I thought the best way to attack this would be:
1. build each of the two section headers into a node,
including both fixed and extended attributes.  For
LineItem, it would like:
  <LineItemHeader>
    <cell column="1">Name</cell>
    <cell column="2">Category</cell>
    <cell column="3">item_ext1</cell>
    <cell column="4">item_ext2</cell>
  </LineItemHeader>
2. for each LineItem element, process its attributes
sequentially according to the column number indicated
in the header node, such as the LineItemHeader shown
above.

So my questions are:
1. Is the above solution fesible?
2. Is there better way to do this?
3. If there is no better way to do this, how can the
first step, i.e. build the header node, be achieved?
4. Would this solution be still fesible if the
RFQExtendAttrDef elements does NOT exist? (this is a
possibility in certain cases) Building the header node
would require scan all LineItem elements for unique
attributes.

Sorry for the long winded description, hope I managed
to describe the problem clearly.  Any suggestions
would be very much appreciated.

Thanks,
Xiaocun

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