PL/SQL :: Repeatable Blocks With Range In Oracle?

find the below table. The entire data is within DOCSTART and DOCEND. The data is further enclosed within BACCSTART and BACCEND. This type of block is repeatable. I have to pick up any of ABCD which is also repeatable and TOTAL(occurring once per block) and ACCNAME (occurring once per block) for each block within BACCSTART and BACCEND and form an xml like

<BACCSTART>
<TOTAL>100</TOTAL>
<ABCD>abcd</ABCD>
<ACCNAME>name</ACCNAME>
</BACCSTART>

for each such block. Presently I am using a for loop, but the performance is not up to the mark. It will have around 200 such blocks for which I have to form the xmls within 15 seconds. Presently the for loop is taking around 53 secs.

ROWNUM   NAME     VALUE
1 DOCSTART null
2 BACCSTART null
3 ABCD abcd
4 ABCD abcd2
5 PQRS pqrs
6 PQRS pqrs2
7 TOTAL 100
8 ACCNAME name
9 BACCEND null
10 BACCSTART null
11 ABCD abcd
12 ABCD abcd2
13 PQRS pqrs3
14 PQRS pqrs4
15 TOTAL 150
16 ACCNAME name
17 BACCEND null
18 DOCEND null