Template Rules or apply-templates:
Template rules are xsl:template statements with match attributes. Template rules are supported by the XSLT Map Editor. <xsl:apply-template> tag signals the XSLT processor to find the appropriate template to apply, based on the type and context of each selected node.
<xsl:apply-templates> is a little different with named template and it is the real power of XSLT: It takes any number of XML nodes (whatever you define in the select attribute), iterates them (this is important: apply-templates works like a loop!) and finds matching templates for them:
A concept to understand with XSLT is that of the "current node". With <xsl:apply-templates> the current node moves on with every iteration, whereas <xsl:call-template> does not change the current node. I.e. the . within a called template refers to the same node as the . in the calling template. This is not the case with apply-templates.
There are some other aspects of templates that affect their behavior: Their mode and priority, the fact that templates can have both a name and a match. It also has an impact whether the template has been imported (<xsl:import>) or not. These are advanced uses and you can deal with them when you get there.
Use case:
Here i will concatenate the employee names with a space from a set of employess input xml using apply template.
Input XML:
Choose synchronous BPEL process
Change the XSD as required.
Choose the source and target payloads
Add the apply templates
Deploy and Test
Template rules are xsl:template statements with match attributes. Template rules are supported by the XSLT Map Editor. <xsl:apply-template> tag signals the XSLT processor to find the appropriate template to apply, based on the type and context of each selected node.
<xsl:apply-templates> is a little different with named template and it is the real power of XSLT: It takes any number of XML nodes (whatever you define in the select attribute), iterates them (this is important: apply-templates works like a loop!) and finds matching templates for them:
A concept to understand with XSLT is that of the "current node". With <xsl:apply-templates> the current node moves on with every iteration, whereas <xsl:call-template> does not change the current node. I.e. the . within a called template refers to the same node as the . in the calling template. This is not the case with apply-templates.
There are some other aspects of templates that affect their behavior: Their mode and priority, the fact that templates can have both a name and a match. It also has an impact whether the template has been imported (<xsl:import>) or not. These are advanced uses and you can deal with them when you get there.
Use case:
Here i will concatenate the employee names with a space from a set of employess input xml using apply template.
Input XML:
<Employees>
<Employee>
<Id>1ws</Id>
<Name>test1</Name>
</Employee>
<Employee>
<Id>2ws</Id>
<Name>test2</Name>
</Employee>
</Employees>
Output expected: test1 test2
Implementation steps:
Implementation steps:
Create a SOA project
<xsl:template
match="/">
<ns0:processResponse>
<ns0:result>
<xsl:apply-templates
select="/ns0:Employees/ns0:Employee/ns0:Name"/>
</ns0:result>
</ns0:processResponse>
</xsl:template>
<xsl:template
match="/ns0:Employees/ns0:Employee/ns0:Name">
<xsl:value-of select="concat('
',.)"/>
</xsl:template>
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