Within--interMedia

Question

I use oracle 8.1.7.
I have a table
MedlineXML (PMID Number Primary Key,
MedlineId Number,
Citation CLOB)
where Citation is of xml format.
I create index:
CREATE INDEX xmlindex ON MedlineXML(Citation) INDEXTYPE IS
ctxsys.context
parameters('storage mystore filter ctxsys.null_filter section group
autogroup memory 30M');
I cannot explain the following, as Author is outer tag of LastName. But
"within Author results in less citations than within LastName.
Also I cannot do "nest within", i.e., 'Robinson within LastName within
Author'. Any help?
select count(*) from MedlineXML where CONTAINS (citation,'Robinson
within Author')>0;
COUNT(*)
20808
Elapsed: 00:00:36.28
select count(*) from MedlineXML where CONTAINS (citation,'Robinson
within LastName')>0;
COUNT(*)
20870
Elapsed: 00:00:29.23
PS. Eaxmple of xml data:
<AuthorList>
<Author>
<LastName>Courtright</LastName>
<ForeName>L J</ForeName>
<Initials>LJ</Initials>
</Author>
<Author>
<LastName>Kuzell</LastName>
<ForeName>W C</ForeName>
<Initials>WC</Initials>
</Author>
</AuthorList>

Answer 1

No, we did not try XML_SECTION_GROUP, as we got too many tags
and AUTO_SECTION_GROUP will automatically create a zone section
for each start_tag/end-tag pair in XML document.
According Intermedia Document, it should also work without problem.