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<body lang=EN-US link=blue vlink=purple style='text-justify-trim:punctuation'>

<div class=Section1 style='layout-grid:15.6pt'>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The XQuery spec makes it clear that it is the namespace URI of
the schema and the local name of the component that uniquely identifies a
schema component. Since equivalence of schema components from different schema
files is not defined in XQuery, the result is system-dependent on how far the
type equivalence investigation goes during the compilation/linking of the two
modules.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best regards<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Michael<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>

<p class=MsoNormal align=left style='text-align:left'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
talk-bounces@x-query.com [mailto:talk-bounces@x-query.com] <b>On Behalf Of </b>Chen,
Haifeng<br>
<b>Sent:</b> Wednesday, January 09, 2008 6:34 PM<br>
<b>To:</b> talk@x-query.com<br>
<b>Subject:</b> [xquery-talk] What identifies an XML schema in XQuery, target
namespace or schema location?<o:p></o:p></span></p>

</div>

</div>

<p class=MsoNormal align=left style='text-align:left'><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Dear
XQuery experts,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>I
come to a question related to the schema import in XQuery. The following is the
context,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='layout-grid-mode:char'><b><span style='font-size:
11.0pt;font-family:"Verdana","sans-serif"'>Given two XSD files named hats1.xsd
and hats2.xsd (note: contents of these two files are the same) stored at the
current directory as following,<o:p></o:p></span></b></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>1.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>hats1.xsd (A schema
defines a simple type HatSize)<o:p></o:p></span></b></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;?xml
version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;xs:schema
xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>xmlns=&quot;http://www.hats.com/hats&quot;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>targetNamespace=&quot;http://www.hats.com/hats&quot;&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;xs:simpleType
name=&quot;HatSize&quot;&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;xs:restriction
base=&quot;xs:integer&quot;&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;xs:minInclusive
value=&quot;1&quot;/&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;xs:maxInclusive
value=&quot;10&quot;/&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/xs:restriction&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;/xs:simpleType&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;/xs:schema&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>2.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>hats2.xsd (A schema
defines a simple type HatSize)<o:p></o:p></span></b></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;?xml
version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;xs:schema
xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>xmlns=&quot;http://www.hats.com/hats&quot;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>targetNamespace=&quot;http://www.hats.com/hats&quot;&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;xs:simpleType
name=&quot;HatSize&quot;&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;xs:restriction
base=&quot;xs:integer&quot;&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;xs:minInclusive
value=&quot;1&quot;/&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;xs:maxInclusive value=&quot;10&quot;/&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/xs:restriction&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;/xs:simpleType&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>&lt;/xs:schema&gt;<o:p></o:p></span></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='layout-grid-mode:char'><b><span style='font-size:
11.0pt;font-family:"Verdana","sans-serif"'>Given two XQuery files named
module1.xq and module2.xq stored at the current directory as following,<o:p></o:p></span></b></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>3.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>module1.xq (A
module contains a function simply return a HatSize instance, importing schema
hats1.xsd)<o:p></o:p></span></b></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>module
namespace module1=&quot;http://www.hats.com/module1&quot;;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>import
schema namespace hats=&quot;http://www.hats.com/hats&quot; at
&quot;hats1.xsd&quot;;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>declare
function module1:function1() as hats:HatSize<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>{<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
text-indent:21.0pt;layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'>5 cast as hats:HatSize<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>};<o:p></o:p></span></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l0 level1 lfo2;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>4.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>module2.xq (Main
module call the function and test instance of HatSize over the instance,
importing schema hats2.xsd)<o:p></o:p></span></b></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>import
module namespace module1=&quot;http://www.hats.com/module1&quot; at
&quot;module1.xq&quot;;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>import
schema namespace hats=&quot;http://www.hats.com/hats&quot; at
&quot;hats2.xsd&quot;;<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='margin-left:10.5pt;mso-para-margin-left:1.0gd;
layout-grid-mode:char'><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>module1:function1()
instance of hats:HatSize<o:p></o:p></span></p>

<p class=MsoNormal style='layout-grid-mode:char'><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='layout-grid-mode:char'><b><span style='font-size:
11.0pt;font-family:"Verdana","sans-serif"'>Question: <o:p></o:p></span></b></p>

<p class=MsoNormal style='layout-grid-mode:char'><b><span style='font-size:
11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></b></p>

<p class=MsoNormal style='layout-grid-mode:char'><b><span style='font-size:
11.0pt;font-family:"Verdana","sans-serif"'>What&#8217;s the right result when
evaluating on module2.xq? <o:p></o:p></span></b></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo4;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>A.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>true<o:p></o:p></span></b></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo4;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>B.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>false<o:p></o:p></span></b></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo4;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>C.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>static error should
be raised<o:p></o:p></span></b></p>

<p class=MsoNormal style='margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo4;
layout-grid-mode:char'><![if !supportLists]><b><span style='font-size:11.0pt;
font-family:"Verdana","sans-serif"'><span style='mso-list:Ignore'>D.<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp; </span></span></span></b><![endif]><b><span
style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>dynamic error
should be raised<o:p></o:p></span></b></p>

<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></b></p>

<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>It
is actually asking &#8220;what identifies an XML schema, target namespace or schema
location?&#8221;<o:p></o:p></span></b></p>

<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></b></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Thanks,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'>Haifeng
Chen<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Verdana","sans-serif"'><o:p>&nbsp;</o:p></span></p>

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