Limitations of Path Section Group Indexing with alphabet I

Question

Hi,
I created oracle text context indexing with Path section group and was trying to retrieve an element using the below query but it was not giving me any output
select /*+FIRST_ROWS*/rowid,abccolumn,xyz column, efgcolumn,
from xyz table
where contains(xyzcolumn, 'I INPATH (/a:xyz/b:abc/c:efg/d:hij)',1)>0 )
but with the same query instead of I if i am replacing with O i am getting the output.
I wanted to know the significance of I as i was to retrieve all the other columns based on the search criteria .
There are only 2 elements I or O in that node.
with O i am able to retrieve so wanted to know how i can retrieve with I

Answer 1

begin
ctx_ddl.drop_section_group('xyz_path_group');
end;
begin
ctx_ddl.drop_preference('xyz_wildcard_pref1');
end;
begin
ctx_ddl.drop_preference('xyz_word_PREF');
end;
begin
ctx_ddl.drop_preference('xyz_lexer_PREF1');
end;
begin
ctx_ddl.create_section_group('xyz_path_group','PATH_SECTION_GROUP');
end;
begin
ctx_ddl.create_preference('xyz_word_PREF','BASIC_WORDLIST');
ctx_ddl.set_attribute('xyz_word_PREF','SUBSTRING_INDEX','TRUE');
ctx_ddl.set_attribute('xyz_word_PREF','PREFIX_INDEX','YES');
end;
begin
ctx_ddl.create_preference('xyz_lexer_pref1','BASIC_LEXER');
ctx_ddl.set_attribute('xyz_word_PREF','WILDCARD_MAXTERMS','15000');
end;
drop index xyz;
create index xyz on abc(pqr) indextype is ctxsys.context parameters
('datastore ctxsys.direct_datastore wordlist xyz_word_PREF FILTER ctxsys.null_filter lexer xyz_lexer_pref1
sync(on commit)SECTION GROUP xyz_path_group MEMORY 500M ');
This is how i created index and the table i have several column but the column pqr i am indexing has XML (Large) xml with 15 namespaces and with 3 prefixes