Querying in the xmltype table

Question

apart from XQuery,
i know Oracle provided X-Path based search also.
can anyone direct me what's wrong with the following statement?
it returns "no rows selected".
THX~
e.g.1
select extract(value(it),'/Cap/@ctitle').getStringVal() as CTITLE
from ord_xmltype_tbl,
table (xmlsequence(extract(object_value,'Ordinace/Chapter/Cap'))) it
where contains (object_value,'Commonwealth INPATH (/Ordinance/Chapter/Cap/Section/Content/English)') > 0;
e.g.2
select extract(object_value,'/Ordinance/Chapter/Cap/@ctitle').getStringVal() as CTITLE
from ord_xmltype_tbl,
table (xmlsequence(extract(object_value,'/Ordinace/Chapter/Cap'))) it
where existsnode(object_value,'//English[contains(.,"SHORT TITLE AND APPLICATION")>0]')>0;
e.g.3
select extract(value(it),'/Cap/@ctitle').getStringVal() as CTITLE
from ord_xmltype_tbl,
table (xmlsequence(extract(object_value,'/Ordinace/Chapter/Cap'))) it
where existsnode(object_value,'//English[ora:contains(.,"SHORT TITLE AND APPLICATION")>0]', 'xmlns:ora="http://xmlns.oracle.com/xdb"')>0;
and what index i should create for the xmltype table?
in order to speed up the search?
this is the skeleton of the xmltype table
<Ordinance xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://localhost:8081/public/hkliss/ordinance.xsd">
<Chapter ctitle="致命意外條例" etitle="FATAL ACCIDENTS ORDINANCE" id="22">
<Cap ctitle="致命意外條例" etitle="FATAL ACCIDENTS ORDINANCE" id="22">
<Section ctitle="詳題" etitle="Long title" id="0">
<VersionDate>1997-06-30</VersionDate>
<Content>
<Chinese></Chinese>
<English></English>
</Content>
</Section>
</Cap>
<Cap>....</Cap>
<Cap>....</Cap>
<Cap>....</Cap>
<Cap>....</Cap>
<Cap>....</Cap>
<Cap>....</Cap>
</Chapter>
</Ordinance>
thx, expert~
i'm held up in my project right now~~~

Answer 1

(please read a little from the manuals...you have already spend so much time on asking stuff, that if you would have
read manuals, you also would understand the things pointed out to you and it would have given you a faster result...)
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/functions051.htm#i1006712
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/functions048.htm#i1006711
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/functions052.htm#i1131042
The optional namespace_string must resolve to a VARCHAR2 value that specifies a default mapping or namespace mapping for prefixes, which Oracle uses when evaluating the XPath expression(s).
is xmlns:ora="http://xmlns.oracle.com/xdb evaluating your Xpath expression, I don't think so...
If I take your examples shown here (http://forums.oracle.com/forums/message.jspa?messageID=1765571#1765571) as a starting point...
the query:
select extract(value(it),'/Cap/@ctitle').getStringVal() as CTITLE
from ord_xmltype_tbl,
table (xmlsequence(extract(object_value,'/Ordinace/Chapter/Cap'))) it
where existsnode(object_value,'//English[ora:contains(.,"SHORT TITLE AND APPLICATION")>0]', 'xmlns:ora="http://xmlns.oracle.com/xdb"')>0;would resolve in
select extract(value(it),'/Cap/@ctitle').getStringVal() as CTITLE
from ord_xmltype_tbl,
table (xmlsequence(extract(object_value,'/Ordinace/Chapter/Cap', 'xmlns:ora="http://localhost:8081/public/hkliss/ordinance.xsd"'))) it
where existsnode(object_value,'//English[ora:contains(.,"SHORT TITLE AND APPLICATION")>0]', 'xmlns:ora="http://localhost:8081/public/hkliss/ordinance.xsd"')>0;
But I would start with a simple "extract" or "existnode" statement, see if I get data output, and then build my SQL statement from there.