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Re: [xsl] Comparing before and after records [SEC=UNCLASSIFIED]

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Please try this stylesheet, just wrap a xsl:result-document instruction to the template for After to create separate XML files:

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/ Transform">
<xsl:key name="Before_Events" match="Before" use="Event_Id"/>
<xsl:template match="/">
<xsl:apply-templates select="Events/After"/>
</xsl:template>
<xsl:template match="/Events/After">
<Event>
<xsl:choose>
<xsl:when test="key('Before_Events', Event_Id)">
<Operation>MODIFY</Operation>
<xsl:comment select="if (key('Before_Events', Event_Id)/ Event_Field != Event_Field) then 'Changed' else 'Unchanged'"></ xsl:comment>
</xsl:when>
<xsl:otherwise>
<Operation>CREATE</Operation>
</xsl:otherwise>
</xsl:choose>
<xsl:copy-of select="Event_Field"/>
</Event>
</xsl:template>
</xsl:stylesheet>

Hope this helps,
-- Jeff

On 07 8, 08, at 7:15 AM, Enrico.Raymund@xxxxxxxxxxx wrote:

Hi Greg,

Thanks. Yeah, that's a typo there, but it definitely will not work as it
needs to include the Event_Id of current context (After) and corresponding
Before/Event_Id.

regards,

Enrico Raymundo




"Greg Fausak"
<lgfausak@xxxxxxx
om> To
xsl- list@xxxxxxxxxxxxxxxxxxxxx
08/07/2008 12:57 m
AM cc

Subject
Please respond to Re: [xsl] Comparing before and
xsl-list@xxxxxxxx after records
lberrytech.com [SEC=UNCLASSIFIED]
Protective Mark










Hi,

I'm kinda new to the list and to xslt.  But, trying to understand
what you're doing here.

First, you reference:
---
                   <xsl:when test="//Before/Even_Field/text() =
Event_Field/text()">
                       <xsl:comment>unchanged</xsl:comment>
                   </xsl:when>
---

Probably just an example error, but, Event_Field instead of Even_Field.

-g


On Mon, Jul 7, 2008 at 1:33 AM, <Enrico.Raymund@xxxxxxxxxxx> wrote:

Hi Abel,

I was not able to come back to you sooner but here it is:

XML Input:
<?xml version="1.0" encoding="UTF-8"?>
<Events>
   <Before>
       <Event_Type>A</Event_Type>
       <Event_Field>1111</Event_Field>
       <Event_Id>1001</Event_Id>
   </Before>
   <Before>
       <Event_Type>B</Event_Type>
       <Event_Field>2222</Event_Field>
       <Event_Id>1002</Event_Id>
   </Before>
   <After>
       <Event_Type>A</Event_Type>
       <Event_Field>1111</Event_Field>
       <Event_Id>1001</Event_Id>
   </After>
   <After>
       <Event_Type>B</Event_Type>
       <Event_Field>2233</Event_Field>
       <Event_Id>1002</Event_Id>
   </After>
   <After>
       <Event_Type>C</Event_Type>
       <Event_Field>1122</Event_Field>
       <Event_Id>1003</Event_Id>
   </After>
</Events>

The XSL file:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output encoding="UTF-8" indent="yes" method="xml" version="1.0"/>
<xsl:strip-space elements="*"/>
<xsl:key match="/Events/Before" name="BEFORE_ID" use="Event_Id"/>
<!-- Root Template -->
<xsl:template match="/">
<xsl:choose>
<xsl:when test="count(//After) &gt; 0">
<xsl:for-each select="//After">
<xsl:choose>
<xsl:when test="key('BEFORE_ID', Event_Id)">
<xsl:call-template
name="INSTANTIATE_MODIFY_EVENT">
<xsl:with-param name="EVENT_TYPE"
select="Event_Type"/>
<xsl:with-param name="AFTER_EVENT_ID"
select="Event_Id"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:call-template
name="INSTANTIATE_CREATE_EVENT">
<xsl:with-param name="EVENT_TYPE"
select="Event_Type"/>
<xsl:with-param name="AFTER_EVENT_ID"
select="Event_Id"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:when>
<xsl:otherwise>
<!-- No occurence of 'After': there is nothing to output

-->

</xsl:otherwise>
</xsl:choose>
</xsl:template>
<!-- =============================================================-->
<!-- NAMED TEMPLATES -->
<!-- =============================================================-->
<xsl:template name="INSTANTIATE_MODIFY_EVENT">
<!-- MODIFY -->
<xsl:param name="EVENT_TYPE"/>
<xsl:param name="AFTER_EVENT_ID"/>
<xsl:result-document encoding="utf-8"
href="{$EVENT_TYPE}_{$AFTER_EVENT_ID}.xml"
indent="yes" method="xml">
<Event>
<Operation>MODIFY</Operation>
<xsl:choose>

<!-- ### THIS IS WHERE I NEED HELP ###-->
<!-- NEED TO TAKE INTO CONSIDERATION the Event_Id of

the current (After) context -->

<!-- CAN THIS BE DONE WITHOUT USING key() and

generate-id()? -->

                   <xsl:when test="//Before/Even_Field/text() =
Event_Field/text()">
                       <xsl:comment>unchanged</xsl:comment>
                   </xsl:when>
                   <!-- ### THIS IS WHERE I NEED HELP ###-->

                   <xsl:otherwise>
                       <xsl:comment>changed</xsl:comment>
                   </xsl:otherwise>
               </xsl:choose>
               <Field>
                   <xsl:value-of select="Event_Field"/>
               </Field>
           </Event>
       </xsl:result-document>
       <!-- CREATE -->
   </xsl:template>

   <xsl:template name="INSTANTIATE_CREATE_EVENT">
       <xsl:param name="EVENT_TYPE"/>
       <xsl:param name="AFTER_EVENT_ID"/>
       <xsl:result-document encoding="utf-8"
href="{$EVENT_TYPE}_{$AFTER_EVENT_ID}.xml"
           indent="yes" method="xml">
           <Event>
               <Operation>CREATE</Operation>
               <Field>
                   <xsl:value-of select="Event_Field"/>
               </Field>
           </Event>
       </xsl:result-document>
   </xsl:template>
</xsl:stylesheet>

The requirements are as follows:

(1) Create a separate XML file for each "After" instance.
(2) If an "After" instance has no corresponding "Before" instance,

related

by EventId, then this a create operation, ie,

<Operation>CREATE</Operation>

(3) If an "After" instance has a corresponding "Before" instance,

related

by EventId, then this a modify operation, ie,

<Operation>MODIFY</Operation>

(3.1) If the value of the Before/Event_Field != to

After/Event_Field,

put a comment: "<!--changed-->"
(3.2) If the value of the Before/Event_Field = to After/ Event_Field,
put a comment: "<!--unchanged-->"

The code between "<!-- ### THIS IS WHERE I NEED HELP ###-->" is where I
need a proper XPath put in. With the input XML, the XSLT creates 3 XML
files -- which it does, the XSLT created the following files:

A_1001.xml  [the comment is wrong (as the XPath is wrong):
Before/EventField = 1111; After/EventField = 1111 (unchanged)]

<?xml version="1.0" encoding="utf-8"?>
<Event>
   <Operation>MODIFY</Operation>
   <!--changed-->
   <Field>1111</Field>
</Event>

B_1002.xml [the comment field is correct:   Before/EventField = 2222;
After/EventField = 2233 (changed)]

<?xml version="1.0" encoding="utf-8"?>
<Event>
   <Operation>MODIFY</Operation>
   <!--changed-->
   <Field>2233</Field>
</Event>

C_1003.xml [This is correct because there is no <Before> for
EventId="1003"]

<?xml version="1.0" encoding="utf-8"?>
<Event>
   <Operation>CREATE</Operation>
   <Field>1122</Field>
</Event>

Thanks in advance.

Enrico





Abel Braaksma
<abel.online@xs4a
ll.nl> To
xsl- list@xxxxxxxxxxxxxxxxxxxxx
03/07/2008 05:22 m
PM cc

Subject
Please respond to Re: [xsl] Comparing before
xsl-list@xxxxxxxx and after records
lberrytech.com [SEC=UNCLASSIFIED]
Protective Mark










Enrico.Raymund@xxxxxxxxxxx wrote:

The creation of the multiple output document and the transformations are
easy. The help I need is in comparing the <Before> and <After> contents
with the same <EventId>.

Your example input and output looks excellent and clearly indented, but
please also show us your current xslt file, so we can help you with
where you went wrong (and explain what you tried so we can understand
where you're coming from). Now it's just a guessing game... (see the
list guidelines for more help).

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--
Greg Fausak
greg@xxxxxxxxxxxx

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