Parsing error : Element already declared

Question

Hi
I am facing problem while using namespace.
In a prototype, while using xml and dtd I tried to use namespace in using parameter entity. Despite using namespace I am getting error element already declared.
If I don't use parameter entity then the prototype works.
In the following prototype, poNmSpace.xml makes use of poNmSpace.dtd which in turn makes use of xhtml.dtd
I am trying to parse poNameSpace.xml using oracle parser and I am getting following error
Am I doing something wrong ?
** Parsing error, line 19, uri file:/D:/Users/Anup/work/Event/xml/Oracle/sa
x/paraEntyNmSpace/xml/poNmSpace.dtd
Element 'title' already declared.
file:/D:/Users/Anup/work/Event/xml/Oracle/sax/paraEntyNmSpace/xml/poNmSpace
.dtd<Line 19, Column 16>: XML-0131: (Error) Element 'title' already declare
d.
at oracle.xml.parser.v2.XMLError.flushErrorHandler(XMLError.java, C
ompiled Code)
at oracle.xml.parser.v2.XMLError.flushErrors(XMLError.java:216)
at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValida
tingParser.java:247)
at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:151)
at Echo.main(Echo.java:58)
poNmSpace.xml
=============
<?xml version='1.0' encoding='us-ascii'?>
<!-- A SAMPLE purchase order -->
<!DOCTYPE purchaseorder SYSTEM "poNmSpace.dtd" [
<!ENTITY ponumber "1">
<!ENTITY copyright SYSTEM "copyright.xml">
]>
<!-- SUBSTITUTIONS WORK IN ATTRIBUTES, TOO -->
<purchaseorder
author="Anupam Vaval"
>
<!-- Makes use of the dynamic entity &ponumber; and &copyright; from other XML file
copyright.xml -->
<title nsprefix:a1 = "v1"> This is sample title</title>
<ref refno="&ponumber;"></ref>
<message>&copyright;</message>
<message>purchase order &ponumber; generated</message>
</purchaseorder>
poNmSpace.dtd
=============
<?xml version='1.0' encoding='us-ascii'?>
<!--
DTD for a simple "purchase order".
-->
<!-- Defines the %inline; declaration -->
<!ENTITY % xhtml SYSTEM "xhtml.dtd">
%xhtml;
<!ELEMENT purchaseorder (title, ref, message*)>
<!ATTLIST purchaseorder
author CDATA "unknown"
>
<!ELEMENT title (%inline)*>
<!ATTLIST title nsprefix:a1 CDATA #IMPLIED>
<!ELEMENT ref (#PCDATA)>
<!ATTLIST ref
refno CDATA #IMPLIED
>
<!ELEMENT message (#PCDATA)>
xhtml.dtd
=========
<?xml version='1.0' encoding='us-ascii'?>
<!--
This DTD does some of what the W3C is getting ready to do with its
"XHTML" work (nee "Voyager"). It differs from the current WG draft
because it uses namespaces correctly (!), and it isn't as complete
even for HTML 3.2 support (much less 4.0) or, probably, correct.
Note that what XHTML needs to do is become modular enough that XHTML
can be used as a mixin with other document types, including either
"the whole megillah" or just selected modules (e.g. omitting tables).
That must work both ways ... other things as mixins to XHTML, and
XHTML as a mixin to other things.
THIS WILL BE REPLACED WITH A BETTER DTD AT SOME POINT.
-->
<!ELEMENT html (head, body)>
<!ATTLIST html
xmlns CDATA #FIXED "http://www.example.com/xhtml"
>
<!ELEMENT head (title,style*)>
<!ELEMENT title (#PCDATA)>
<!ATTLIST title nsprefix:a2 CDATA #IMPLIED>
<!ELEMENT style (#PCDATA)>
<!ATTLIST style
type CDATA #IMPLIED
>
<!ENTITY % content "p|h1|h2|h3|h4|h5|h6|ul|ol|table|center">
<!ENTITY % inline "#PCDATA|em|b|a|img|br">
<!ELEMENT em (#PCDATA|a|b|img|br)*>
<!ELEMENT b (#PCDATA|a|em|img|br)*>
<!ELEMENT a (#PCDATA|b|em|img|br)*>
<!ATTLIST a
href CDATA #IMPLIED
name CDATA #IMPLIED
>
<!ELEMENT br EMPTY>
<!ELEMENT img EMPTY>
<!ATTLIST img
alt CDATA #IMPLIED
border CDATA #IMPLIED
height CDATA #IMPLIED
src CDATA #REQUIRED
width CDATA #IMPLIED
>
<!ELEMENT body (%content;)+>
<!ATTLIST b ody
bgcolor CDATA #IMPLIED
>
<!ELEMENT p (%inline;)*>
<!ELEMENT h1 (%inline;)*>
<!ELEMENT h2 (%inline;)*>
<!ELEMENT h3 (%inline;)*>
<!ELEMENT h4 (%inline;)*>
<!ELEMENT h5 (%inline;)*>
<!ELEMENT h6 (%inline;)*>
<!ELEMENT ul (li+)>
<!ELEMENT ol (li+)>
<!ELEMENT li (%inline;)*>
<!ELEMENT table (tr+)>
<!ATTLIST table
height CDATA #IMPLIED
width CDATA #IMPLIED
align (left|center|right) #IMPLIED
cellspacing CDATA #IMPLIED
>
<!ELEMENT tr (td+)>
<!ATTLIST tr
align (left|center|right) #IMPLIED
valign (top|center|bottom|baseline) #IMPLIED
>
<!ELEMENT td (%inline;|%content;)*>
<!ATTLIST td
height CDATA #IMPLIED
width CDATA #IMPLIED
align (left|center|right) #IMPLIED
valign (top|center|bottom|baseline) #IMPLIED
rowspan CDATA #IMPLIED
colspan CDATA #IMPLIED
>
<!ELEMENT center (%inline;|%content;)*>

Answer 1

Rana,
You'll probably get better answers for BPEL related questions if you post them on the BPEL forum here:
BPEL