transforming xml part ii
DESCRIPTION
Transforming XML Part II. John Arnett, MSc Standards Modeller Information and Statistics Division NHSScotland Tel: 0131 551 8073 (x2073) mailto:[email protected] http://isdscotland.org/xml. XML Document Transformation with XSLT. Contents. XML Document Processing - PowerPoint PPT PresentationTRANSCRIPT
Transforming XML Part II
XML Document Transformation with XSLT
John Arnett, MScStandards ModellerInformation and Statistics DivisionNHSScotlandTel: 0131 551 8073 (x2073)mailto:[email protected]://isdscotland.org/xml
Contents
• XML Document Processing• XSL Stylesheets• XSLT
– Template Rules– Processing Instructions
• Summary• Find Out More
XML Document Processing
• Transformation and formatting– XPath used to locate nodes for
input– XSLT used to transform input
and generate result tree – XSL-FO used to format output
document
XSL Stylesheets
• The Stylesheet element
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/"><xsl:apply-templates/>
</xsl:template><xsl:template match="pattern">
<!-- XSLT processing instructions --></xsl:template><!-- More template rules... -->
</xsl:stylesheet>
XSL Stylesheets
• Template Rules
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/"><xsl:apply-templates/>
</xsl:template><xsl:template match="pattern">
<!-- XSLT processing instructions --></xsl:template><!-- More template declarations... -->
</xsl:stylesheet>
XSL Stylesheets
• Processing Instructions
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/"><xsl:apply-templates/>
</xsl:template><xsl:template match="pattern">
<!-- XSLT processing instructions --></xsl:template><!-- More template declarations... -->
</xsl:stylesheet>
XSL Stylesheets
read template
find source nodes
evaluate processing instructions
more templates?
yes
no
Adapted from XSLT Basics slide presentation by Paul Spencer, alphaXML
Source Tree
Source Tree
Style sheet
Style sheet
Result Tree
Result Tree
XSLT: Template Rules
• Template Rule – XPath pattern specifies nodes
to match <xsl:template match=“Appointment"></xsl:template>
– Output template contains XSLT processing instructions•ie. for processing input and creating new element and attribute nodes
XSLT: Template Rules
• Template rule for creating PatientId element from Appointment<xsl:template match="Appointment">
<PatientId><Id>
<xsl:value-of select="Patient/@upi"/></Id><Name>
<xsl:value-of select="Patient/text()"/></Name>
</PatientId></xsl:template>
XSLT: Template Rules
• PatientId output from template rule
<PatientId><Id>ABC-123-456</Id><Name>John Smith</Name>
</PatientId>
<PatientId><Id>ABC-123-456</Id><Name>John Smith</Name>
</PatientId>
<PatientId><Id>ABC-123-456</Id><Name>John Smith</Name>
</PatientId>
XSLT: Template Rules
• Appointment List
<AppointmentList>+ <Appointment deptCode=”RADIO”> + <Appointment deptCode=”PHYSIO”>+ <Appointment deptCode=”GMED”> + <Appointment deptCode=”GMED”> + <Appointment deptCode=”CMED”> + <Appointment deptCode=”PHYSIO”>+ <Appointment deptCode=”CMED”>
</AppointmentList>
<AppointmentList>+ <Appointment deptCode=”RADIO”> + <Appointment deptCode=”PHYSIO”>+ <Appointment deptCode=”GMED”> + <Appointment deptCode=”GMED”> + <Appointment deptCode=”CMED”> + <Appointment deptCode=”PHYSIO”>+ <Appointment deptCode=”CMED”>
</AppointmentList>
XSLT: Template Rules
• Applying Template Rules– Creating a list of PatientId’s<xsl:template match="AppointmentList">
<PatientList><xsl:apply-templates/>
</PatientList></xsl:template><xsl:template match="Appointment">
<PatientId><Id><xsl:value-of select="Patient/@upi"/></Id><Name><xsl:value-of
select="Patient/text()"/></Name></PatientId>
</xsl:template>
XSLT: Template Rules
• PatientId’s list output
<PatientList>- <PatientId>
<Id>ABC-123-456</Id> <Name>John Smith</Name>
</PatientId>+ <PatientId>+ <PatientId> … + <PatientId>
</PatientList>
<PatientList>- <PatientId>
<Id>ABC-123-456</Id> <Name>John Smith</Name>
</PatientId>+ <PatientId>+ <PatientId> … + <PatientId>
</PatientList>
XSLT: Processing Instructions
• XSLT - rich syntax that enables– Copying– Conditional processing
<xsl:if test=“@deptCode = ‘PHYSIO’“>...
– Iteration and sorting<xsl:for-each select=“Appointment”>...
– Application of XPath functions<xsl:value-of select="concat(@deptCode,
generate-id(.))">...
– Creation of new nodes
XSLT: Processing Instructions
• XSLT Elements– xsl:styleshe
et– xsl:output– xsl:templat
e– xsl:apply-
templates– xsl:value-of
– xsl:text– xsl:if– xsl:choose– xsl:when– xsl:otherwis
e– xsl:foreach
XSLT: Processing Instructions
• Copying and conditional processing – Creating a list of “PHYSIO”
appointments <xsl:template match="AppointmentList">
<PhysioAppointments> <xsl:apply-templates/>
</PhysioAppointments> </xsl:template> <xsl:template match="Appointment">
<xsl:if test="@deptCode = 'PHYSIO'"> <xsl:copy-of select="."/>
</xsl:if> </xsl:template>
XSLT: Processing Instructions
• “PHYSIO” appointments list output
<PhysioAppointments> - <Appointment deptCode="PHYSIO">
+ <Patient upi="EFG-567-012"> <Clinician>Mark Boydd</Clinician> + <Slot attendDate="05-08-2002">
</Appointment>+ <AppointmentdeptCode="PHYSIO">
</PhysioAppointments>
<PhysioAppointments> - <Appointment deptCode="PHYSIO">
+ <Patient upi="EFG-567-012"> <Clinician>Mark Boydd</Clinician> + <Slot attendDate="05-08-2002">
</Appointment>+ <AppointmentdeptCode="PHYSIO">
</PhysioAppointments>
XSLT: Processing Instructions
• Iteration and sorting– Creating an appointments
summary table<table border="1"> ...
<xsl:for-each select="Appointment"><xsl:sort select="@deptCode"
order="ascending"/><tr>
<td><xsl:value-of select="Patient/text()"/></td> ...
</tr></xsl:for-each>
</table>
XSLT: Processing Instructions
• Appointments summary table output
XSLT: Processing Instructions
• Creating new nodes– XSLT instructions
<xsl:element name="MyNewElement"><xsl:attribute name="myNewAttribute">
value </xsl:attribute>
</xsl:element>
<MyNewElement myNewAttribute="value"/>
– XSLT output
In Summary…
• XSL stylesheets contain one or more XSLT template rules
• Template rules specify nodes to match and contain XSLT processing instructions
• XSLT has a rich syntax for transforming documents into XML and non-XML outputs
Find Out More
• W3C XSL Transformations (XSLT) v1.0 Specification– www.w3.org/TR/xslt
• Getting started with XSLT and XPath by Ken Holman (Parts 1, 2 & 3)– www.xml.com/pub/a/2000/08/h
olman/s2_1.html• ZVON.org - XSLT Tutorial
– www.zvon.org/xxl/XSLTutorial/
Find Out More
• Robert Ducharme’s Transforming XML column– www.xml.com/pub/q/transformin
gxml• TopXML XSLT Stylesheets
– www.topxml.com/xsltstylesheets/default.asp