How to remove the XML prologue in Oracle?

Our system works as follows:

1. place a piece of XML code in the database as a CLOB
2 database converts this value to XMLTYPE (stored as a CLOB (you can skip this, Marco * {;-)))))
3. a request then reads XML from the database and inserts it into another bit of XML
4. the application continues his treatment based on this new composite XML.

So far, the XML that is loaded into the database in step 1 (for various systems) has never contained a prologue. However, a new system came along and is now passing in a prologue. There are problems of application in step 3.

Apart from trying to get the new system do not spend in the prologue, is there a way to remove it of in Oracle?

I came up with two solutions are not elegant:

1. use XMLTABLE to retrieve the main root node (which might be different, depending on the system sent in the data and could change)
2 convert the prologue in a commentary, using REPLACE the product, before converting the CLOB in an XMLTYPE.

If I was forced to use one of the following methods, I would go with 2, but I really, really hope that there is a better way to do it.

Someone at - it any other suggestions, please?

PS. We are currently on 10.2.0.4 and are about to move to 11.2.0.3, but the solution is to work on both versions, for more fun and excitement!

It's error, the application gives: "error obtaining Exception of SAX for additional information: no processing instruction begins with"xml"" who says that the app dev is due to the presence of the prologue in the middle of xml, the app has build up.

So, basically, the app just "glue" XML in the middle of the other regardless of the structure? What kind of design is?
IMO, the application needs to be fixed, not the XML input.

A lot about how to add the prologue, nothing on how to remove it!

You can use the XMLQuery function to get the root element:

SQL> create table tmp_xml3 of xmltype
  2  xmltype store as basicfile clob;

Table created

SQL> insert into tmp_xml3 values (xmltype(''));

1 row inserted

SQL> select * from tmp_xml3;

SYS_NC_ROWINFO$
--------------------------------------------------------------------------------


SQL>
SQL> select xmlquery('*' passing object_value returning content)
  2  from tmp_xml3;

XMLQUERY('*'PASSINGOBJECT_VALU
--------------------------------------------------------------------------------

Published by: odie_63 on August 22, 2012 15:26

Tags: Database

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