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Multiple External References in Transfom

Having worked through the problems around enabling the document function
using an XmlUrlResolver I started work on building a useful class to hide
the intricacies.
Trying to generalise the process I've hit a snag.

How do I resolve multiple external references?

The transform method on a stylesheet only takes one resolver, not an array

Stephen
Nov 12 '05 #1
6 2484
Stephen Cook wrote:
How do I resolve multiple external references?

The transform method on a stylesheet only takes one resolver, not an array


What do you mean? Resolver object is supposed to resolve all external
references, not a single one.
--
Oleg Tkachenko
XML Insider
http://www.tkachenko.com/blog

Nov 12 '05 #2
Aha!

Question becomes - How do I create multiple references within one resolver?

Stephen

"Oleg Tkachenko" <oleg@NO!SPAM!P LEASEtkachenko. com> wrote in message
news:eG******** ******@TK2MSFTN GP12.phx.gbl...
Stephen Cook wrote:
How do I resolve multiple external references?

The transform method on a stylesheet only takes one resolver, not an
array
What do you mean? Resolver object is supposed to resolve all external
references, not a single one.
--
Oleg Tkachenko
XML Insider
http://www.tkachenko.com/blog

Nov 12 '05 #3
Long post - Posted to explain the background to the issue of resolvers,
highlight a couple of further points around evidences and resolution of
paths and hopefully provide a full example that is useful by way of
returning a little of the help I continue to receive from these sort's of
resources.

A bit of background for the casual reader.

The object of the exercise was to create a class that would create a regular
data island (no null attributes) from the output of SQLXML.
This is structured to support the built-in table binding of internet
explorer.

The following example is from my scratch routine, built while I explored the
..Net framework's XML library.
The output stream strmOutput is created externally.
You might use something like

XmlTextWriter writer = new XmlTextWriter(C onsole.Out);
writer.Formatti ng=Formatting.I ndented;
or
XmlTextWriter xtwDump = new
XmlTextWriter(" C:\\dumpXslTest .xml",System.Te xt.Encoding.UTF 8);
xtwDump.Formatt ing = Formatting.Inde nted;

in the web environment, to generate the data island use something like
strmOutput = new
StreamWriter(Ht tpContext.Curre nt.Response.Out putStream,Syste m.Text.Encoding .
UTF8,640);

Anyway all that stuff gets set up in the public methods before calling the
following
(Rest of routine needs re-factoring as presented here, but easier to explain
in one routine)

private Boolean prvTransformDat aset()
{
string strConn = "Database Connection";
// Reference to stylesheet to convert raw XMl into "regular" xml data
island that can be consumed by internet explorer's

table binding
string stylesheet =
"C:\\projects\\ projectfolder\\ BusinessObject\ \general.xslt"; //Point A
below

try
{
//Get the raw XML data
SqlXmlCommand cmd = new SqlXmlCommand(s trConn);
cmd.RootTag = "XML";
cmd.CommandText = "Select * from tablename for xml auto";
cmd.CommandType = SqlXmlCommandTy pe.Sql;
XmlReader xReader = cmd.ExecuteXmlR eader();

//Load into a suitable document
XPathDocument xpathdocument = new
XPathDocument(x Reader,XmlSpace .Preserve);

//Now set up the transform
XslTransform xslt = new XslTransform();
//Transform includes an external reference to a simplifed schema for the
output table
//Which is loaded as a variable in the stylesheet
//<xsl:variable name="Sch"
select="documen t('C:/projects/projectfolder/BusinessObject/tableschema.xml ')
" />
XmlUrlResolver xrsSchema = new XmlUrlResolver( );
Uri uriSchema = new Uri(stylesheet) ;
Uri uriFull = xrsSchema.Resol veUri(uriSchema ,"tableschema.x ml");
xslt.Load(style sheet); //Point B below

//Create an XsltArgumentLis t to pass in the parameterised tags
// A bindable data island has three levels
XsltArgumentLis t xslArg = new XsltArgumentLis t();
xslArg.AddParam ("Island","" , "dsoTableNameId ");
xslArg.AddParam ("Group","", "CollectionName ");
xslArg.AddParam ("Line","", "Data");

//Now ready to perform the transform
// Finally worked when I included the reference to the resolver here
rather than at stylesheet load
// I don't understand what causes the difference (I make mistakes??)
xslt.Transform( xpathdocument, xslArg, strmOutput, xrsSchema);
// Make sure we get the whole thing - Again this didn't appear to be
necessary.
strmOutput.Flus h();
return(true);
}
catch(Exception e)
{
XmlTextWriter txwError = new XmlTextWriter(C onsole.Error);
txwError.WriteR aw(("Error in try" + e.ToString()));
return(false);
}
finally
{
//Lots of tidy up in here
}
}

Point A.

This is the full transform (well something like it anyway)
This variant generates the data as attributes. It's not hard to convert to
generate data as tags (exercise for the reader)
Note that there is no namespace handling in here
All null attributes are generated
and all dates are translated in to a more human-friendly format

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:transfor m xmlns:xsl="http ://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xsl xs"
version="1.0">

<xsl:output method="xml" indent="yes"/>

<xsl:param name="Island" select="'island Id'"/>
<xsl:param name="Group" select="'collec tion'"/>
<xsl:param name="Line" select="'data'"/>
<xsl:variable name="Sch"
select="documen t('C:/projects/projectfolder/BusinessObject/tablename.xml') "
/>

<!--Match the root node -->
<xsl:template match="/">
<xsl:element name="xml">
<xsl:attribut e name="id">
<xsl:value-of select="$Island "/>
</xsl:attribute>
<xsl:element name="{$Group}" >
<xsl:apply-templates select="*|@*"/>
</xsl:element>
</xsl:element>
</xsl:template>

<!-- Match each data row -->
<xsl:template match="//tablename"> <!-- this could be a parameter too -->
<xsl:element name="{$Line}">
<!-- store this row in a variable -->
<xsl:variable name='row' select='.'/>
<!-- iterate through each field (from the s:Schema section) -->
<xsl:for-each
select="$Sch/xs:schema/xs:element[@name='lps_loca tion']/xs:complexType/xs:at
tribute">

<xsl:choose>
<!-- test for date time fields to permit extra conversion -->
<xsl:when test="@type='xs :dateTime'">
<!-- copy the name of this field into a variable -->
<xsl:variable name='fieldname ' select='@name'/>
<!-- output the element, and the data value as attribute-->
<xsl:attribut e name='{$fieldna me}'>
<!-- xsl:value-of select='$row/@*[name()=$fieldna me]'/ -->
<xsl:variable name="datevalue " select='$row/@*[name()=$fieldna me]'/>
<xsl:if test="$datevalu e!=''">
<xsl:value-of select="substri ng($datevalue,9 ,2)"/>
<xsl:text>/</xsl:text>
<xsl:value-of select="substri ng($datevalue,6 ,2)"/>
<xsl:text>/</xsl:text>
<xsl:value-of select="substri ng($datevalue,1 ,4)"/>
<xsl:text> </xsl:text>
<xsl:value-of

select="substri ng(substring-after($datevalu e,'T'),1,8)"/>
</xsl:if>
</xsl:attribute>
</xsl:when>
<xsl:otherwis e>
<!-- copy the name of this field into a variable -->
<xsl:variable name='fieldname ' select='@name'/>
<!-- output the element, and the data value as attribute -->
<xsl:attribut e name='{$fieldna me}'>
<xsl:value-of select='$row/@*[name()=$fieldna me]'/>
</xsl:attribute>
</xsl:otherwise>
</xsl:choose>

</xsl:for-each>
</xsl:element>
</xsl:template>

</xsl:transform>

My schema looked somehing like this - you can see I was reading some
addressing data
Only the "required" fields appear by default from SQLXML.
If the values for the any of the other fields are null in the database, no
attribute is generate by SQLXML, so we want to add it.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefa ult="qualified" >
<xs:element name="SGC">
<xs:complexType >
<xs:sequence>
<xs:element ref="lps_locati on" maxOccurs="unbo unded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="lps_locat ion">
<xs:complexType >
<xs:attribute name="LOCATION_ ID" type="xs:short" use="required"/>
<xs:attribute name="INITIAL_L OCATION_ID" type="xs:short" use="required"/>
<xs:attribute name="PREDECESS OR_ID" type="xs:short" use="required"/>
<xs:attribute name="BUILDING" type="xs:string "/>
<xs:attribute name="ROAD" type="xs:string "/>
<xs:attribute name="DISTRICT" type="xs:string "/>
<xs:attribute name="CITY" type="xs:string "/>
<xs:attribute name="COUNTY" type="xs:string "/>
<xs:attribute name="ACTIVE" type="xs:string " use="required"/>
<xs:attribute name="CREATED_B Y" type="xs:string " use="required"/>
<xs:attribute name="CREATED_D ATE" type="xs:dateTi me" use="required"/>
</xs:complexType>
</xs:element>
</xs:schema>
Point B.

I couldn't get any joy from using the overloaded "Load" method
(stylesheet,res olver).
Perhaps this is used to resolve the "xsl:import " and "xsl:includ e"
references????
Note that such an overload is now deprecated and advice appears to be to use
(stylesheet, resolver, evidence)
I didn't get a great deal of joy from evidence either.
Lots of confusion (for me) around http examples, where I was staying in the
middle tier and doing direct file access

I also found that having created this resolver I was getting good data from
both the identifed path and from "C:\tablename.x ml".
The resolver would "fail" for files of different names, but still let
through a file of the same name on either path.
I didn't expect this.
I would have thought that only the exact path I entered would be valid, not
any path in the same domain(???)
I haven't tested in more detail. Perhaps this is a case for sorting out a
credentials object or the evidence object???
Nov 12 '05 #4
Hi Stephen,

I'm currently researching on this issue and will update you as soon as I
get any progress.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."

Nov 12 '05 #5
I assume your interested in the behaviour of the resolver.
Contact me directly if the full working example would be useful, rather than
the slightly mangled version presented here.

Many thanks for your interest

Stephen

"Kevin Yu [MSFT]" <v-****@online.mic rosoft.com> wrote in message
news:ms******** ******@cpmsftng xa06.phx.gbl...
Hi Stephen,

I'm currently researching on this issue and will update you as soon as I
get any progress.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."

Nov 12 '05 #6
Hi Stephen,

We need to use the XmlResolver at different time based on different
situation. For example, to resolve with Document () function, we have to
use it with Transform function. For more information on this issue, you may
refer to:

http://msdn.microsoft.com/library/de...us/cpguide/htm
l/cpconresolvinge xternalxsltstyl esheetsdocument s.asp

Luke
Microsoft Online Support

Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)

Nov 12 '05 #7

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