Get path to nodes by value

Question

Can enybody please help me. I don't know really how to get path from xml
for example, this is xml:
<?xml version="1.0"?>
<purchase_order>
<po_items>
<item>
<name>#Name#</name>
<quantity>#number#</quantity>
</item>
</po_items>
</purchase_order>
and get out path by variebles #Name# and #number#.
In this case i need to get result:
purchase_order/po_items/item/name
and
purchase_order/po_items/item/quantity

Answer 1

Pitty you did not mention your db version.
putting together some functions from FunctX one can write
SQL> with t as (
select xmltype('<?xml version="1.0"?>
<purchase_order>
<po_items>
<item>
<name>#Name#</name>
<quantity>#number#</quantity>
</item>
</po_items>
</purchase_order>') xml from dual
select x.*
  from t t,
  xmltable('declare function local:index-of-node  ( $nodes as node()* ,  $nodeToFind as node() )  as xs:integer*
                   for $seq in (1 to count($nodes))  return $seq[$nodes[$seq] is $nodeToFind]
               declare function local:path-to-node-with-pos  ( $node as node()? )  as xs:string
                   fn:string-join( for $ancestor in $node/ancestor-or-self::*
                                          let $sibsOfSameName := $ancestor/../*[fn:name() = fn:name($ancestor)]
                                       return fn:concat(fn:name($ancestor),
                                                               if (fn:count($sibsOfSameName) <= 1)
                                                               then ""  else fn:concat( "[", local:index-of-node($sibsOfSameName,$ancestor),"]"))
           element e {local:path-to-node-with-pos(//item/name[. = "#Name#"]), element name {//name}},
           element e {local:path-to-node-with-pos(//item/quantity[. = "#number#"]), element name {//quantity}}'
           passing t.xml
           columns value varchar2(50) path 'name',
                        path varchar2(50) path 'text()'
           ) x
VALUE      PATH                                   
#Name#     purchase_order/po_items/item/name      
#number#   purchase_order/po_items/item/quantity  
2 rows selected.