Writing IDs on the same line level

[some]

Hallo,

(Excuse me for writing in English, but my German is not good enough yet)

I have the following problem. I have an xml of the kind:

<root>

<paragraph id="1">
<word id="1">aword</word>
<word id="2">aword</word>
<word id="3">aword</word>
<word id="4">aword</word>
<word id="5">aword</word>
<word id="6">aword</word>
<word id="7">aword</word>
...
<word id="n">aword</word>
<paragraph>


<paragraph id="2">
<word id="1">aword</word>
<word id="2">aword</word>
<word id="3">aword</word>
...
<word id="n">aword</word>
<paragraph>

...

<paragraph id="n">
<word id="1">aword</word>
<word id="2">aword</word>
<word id="3">aword</word>
...
<word id="n">aword</word>
<paragraph>

</root>


I'd like to use xsl-fo to create a pdf which has the corresponding
paragraphs containing their words. But on the left, at the same line
level where a word is located, there must appear the id of that word
put in the corresponding line, separated with a coma.


for example (properly seen with "Arial" font):

-----------------------------------------
.....id-s | text
-----------------------------------------
..............| paragraph 1:
1,2,3,4 | word1 word2 word3 word4
5,6,7,8 | word5 word6 word7 word8
9,10.... | word9 word10
.............|
.............| paragraph 2:
1,2,3,4 | word1 word2 word3 word4
5,6.......| word5 word6
.............|
.............| paragraph 3:
...
-----------------------------------------

Of course it must be done in a way that the change of the words, or
count of words in a paragraph doesn't result in a manual change in
xsl-fo code to keep the numbers at the corresponding level.
Is that possible and how?
Thanks
Regards,
Kiril