Oracle XMLTABLE XPath Substring

I have an Oracle query:

SELECT cxm.*
FROM t_mpgm_rule r,
  XMLTABLE(
              '//Criterion'
              PASSING r.rule_xml
              COLUMNS id_attribute PATH '@AttributeID',
                      id_mpgm_rule PATH '@ID'
          ) cxm    

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It returns data like this:

ID_ATTRIBUTE       ID_MPGM_RULE
27049                      100030.0
100053                      100058.0
100055                      100058.2

I need to remove the .0 and .2 from the ID_MPGM_RULE.
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Bob LearnedAsked:
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slightwv (䄆 Netminder) Commented:
Any number of ways.  Main ones that come to mind:   TRUNC and FLOOR

... trunc( ID_MPGM_RULE) ...
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Bob LearnedAuthor Commented:
The type for that column is XMLTYPE, so the type from the PATH '@ID' appears to be a string, since I get an ORA-07122: invalid number trying to use TRUNC or FLOOR.  If I try to cast it to a number, and I get the same error.
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Bob LearnedAuthor Commented:
I see where the problem is.  I thought the data was numeric, too, but there are a few values like this:

100022.4.1
100022.4.3

I used this expression to get the correct value:

SUBSTR(cxm.id_mpgm_rule, 1, INSTR(cxm.id_mpgm_rule, '.') - 1)

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Bob LearnedAuthor Commented:
I figured this one out myself, but with a little help from my friend.  The comment got me to investigate the data in more detail.
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slightwv (䄆 Netminder) Commented:
Guess I went to dinner at the right time!
Glad to be of very little assistance!

Miss crossing paths with you from time to time as a Badger!
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