[xsl] splittingNode-set2

[mankar@xxxxxxxxxxxxxxx]

Hallo,

Let me please rephrase my question concerning the recursive splitting  of a
particular node set, in order to make it less obscure.

I have this source xml

<?xml version="1.0" encoding="ISO-8859-7"?>
<ROWSET>
      <ROW num="1">
            <SHAPE>
                  <ELEM_INFO>
                        <ELEM_INFO_ITEM>1</ELEM_INFO_ITEM>
                        <ELEM_INFO_ITEM>1003</ELEM_INFO_ITEM>
                        <ELEM_INFO_ITEM>50</ELEM_INFO_ITEM>

                        <ELEM_INFO_ITEM>3</ELEM_INFO_ITEM>
                        <ELEM_INFO_ITEM>2003</ELEM_INFO_ITEM>
                        <ELEM_INFO_ITEM>50</ELEM_INFO_ITEM>

                        <ELEM_INFO_ITEM>8</ELEM_INFO_ITEM>
                        <ELEM_INFO_ITEM>2003</ELEM_INFO_ITEM>
                        <ELEM_INFO_ITEM>50</ELEM_INFO_ITEM>
                  </ELEM_INFO>
                  <ORDINATES>
                        <ORDINATES_ITEM>52</ORDINATES_ITEM>
                        <ORDINATES_ITEM>45</ORDINATES_ITEM>
                        <ORDINATES_ITEM>54</ORDINATES_ITEM> position 3
                        <ORDINATES_ITEM>57</ORDINATES_ITEM>
                        <ORDINATES_ITEM>76</ORDINATES_ITEM>
                        <ORDINATES_ITEM>78</ORDINATES_ITEM>
                        <ORDINATES_ITEM>56</ORDINATES_ITEM>
                        <ORDINATES_ITEM>23</ORDINATES_ITEM> position 8
                        <ORDINATES_ITEM>32</ORDINATES_ITEM>
                  </ORDINATES>
            </SHAPE>
      </ROW>
</ROWSET>

I want to use the ELEM_INFO_ITEM[position() mod 3 = 1][position() &gt; 1]
element's values, which are for this particular example 3 and 8, as the
appropriate positions to split the ORDINATES_ITEM node set into two
separate  nodes-sets.I mean select ORDINATE_ITEM elements from position 3
to 7 as children of an interior element and ORDINATE_ITEM elements from
position 8 to the last as children of another interior element.
The desired output should look like:

<set>
<interior>
<ORDINATES_ITEM>54</ORDINATES_ITEM>
<ORDINATES_ITEM>57</ORDINATES_ITEM>
<ORDINATES_ITEM>76</ORDINATES_ITEM>
<ORDINATES_ITEM>78</ORDINATES_ITEM>
<ORDINATES_ITEM>56</ORDINATES_ITEM>
</interior>
<interior>
<ORDINATES_ITEM>23</ORDINATES_ITEM>
<ORDINATES_ITEM>32</ORDINATES_ITEM>
</interior>
</set>


This is easy to manage, when the source xml is always the same, but it is
not.It is generated dynamically and the total number of ELEM_INFO_ITEM
elements is different each time.This number is always multiple of three, (9
in this example) and cannot be less than six.This means that the number of
the generated interior elements also varies and depends on the number of
ELEM_INFO_ITEM elements.

To be more specific i want, depending on my source xml, to generate as many
interior elements as the ELEM_INFO_ITEM[position()mod3=1][position()&gt; 1]
are, and i get to do this using something
like:

<xsl:for-each
select="ROWSET/ROW/SHAPE/ELEM_INFO/ELEM_INFO_ITEM[position()mod3=1][position()
 &gt;1]">
<interior>...</interior>
</xsl:for-each>

If i for example, had another source xml identical with the first but with
the three last ELEM_INFO_ITEM elements missing, the previous code would
generate exactly one interior element, as i wish it to be.

The hard part is to select the appropriate ORDINATE_ITEM nodes and pass
them as children to the relevant interior element.Can i automate this task
through xslt code?
I mean, since the source is not always the same how can i recursively
specify that the first interior element should always contain ORDINATE_ITEM
elements whose position is greater than or equal to
ELEM_INFO_ITEM[position()mod3=1][2] and less than
ELEM_INFO_ITEM[position()mod3=1][3],
and the second interior element should always contain ORDINATE_ITEM
elements whose position is greater than or equal to
ELEM_INFO_ITEM[position()mod3=1][3] and less than
ELEM_INFO_ITEM[position()mod3=1][4] etc.

How can i do this, since i can't know beforehand, for example if an element
ELEM_INFO_ITEM[position()mod3=1][4]exists, as this always depends on my
source xml.Is there a way to recursively define the appropriate ceiling and
threshold ORDINATE_ITEM position for each sequential interior element.

Please,let me know if  there is a way to obtain this.


Regards
Manousos
Athens