Node Functions

Overview

This article explains how to implement node functions in your mapping files when running them in Zynk Workflow. These functions allow you to use dynamic XPath queries.

• Namespace: urn:NodeFunctions
• Available Since: Zynk Workflow 2.1.4

Declaration

To use node functions, you need to add the namespace declaration to your XSLT file:

<xsl:stylesheet 
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:NodeFunctions="urn:NodeFunctions"
    exclude-result-prefixes="NodeFunctions">

    <!-- transformation -->

</xsl:stylesheet>

Functions

Below is a list of available functions within the urn:NodeFunctions namespace:

Select

Selects XML nodes using an XPath query passed in the form of a string. Since it is just a string, the XPath query can be built up dynamically, rather than being hard coded into the XSLT.

Overloads

• Select(XPathNodeIterator context, string xpath)

Example

Input

<?xml version="1.0" encoding="utf-8"?>
<Company>
    <Products>
        <Product>
            <Sku>ABC</Sku>
            <Supplier>Bob</Supplier>
            <Priority>2</Priority>
        </Product>
        <Product>
            <Sku>ABC</Sku>
            <Supplier>Jon</Supplier>
            <Priority>3</Priority>
        </Product>
        <Product>
            <Sku>ABC</Sku>
            <Supplier>Sam</Supplier>
            <Priority>1</Priority>
        </Product>
        <Product>
            <Sku>ZXY</Sku>
            <Supplier>Sam</Supplier>
            <Priority>1</Priority>
        </Product>
        <Product>
            <Sku>123</Sku>
            <Supplier>Bob</Supplier>
            <Priority>2</Priority>
        </Product>
        <Product>
            <Sku>123</Sku>
            <Supplier>Sam</Supplier>
            <Priority>1</Priority>
        </Product>
        <Product>
            <Sku>123</Sku>
            <Supplier>Jon</Supplier>
            <Priority>3</Priority>
        </Product>
    </Products>
</Company>

XSLT

<xsl:stylesheet 
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:NodeFunctions="urn:NodeFunctions"
    exclude-result-prefixes="NodeFunctions">

    <xsl:output indent="yes"/>

    <xsl:template match="/Company">
        <SampleOutput>
            <xsl:variable name="DynamicXPath">Products/Product[Priority=1]</xsl:variable>
            <xsl:for-each select="NodeFunctions:Select(., $DynamicXPath)">
                <Priority><xsl:value-of select="concat('[', Priority, '] ', Sku)" /></Priority>
            </xsl:for-each>
        </SampleOutput>
    </xsl:template>

</xsl:stylesheet>

Output

<?xml version="1.0" encoding="utf-8"?>
<SampleOutput>
    <Priority>[1] ABC</Priority>
    <Priority>[1] ZXY</Priority>
    <Priority>[1] 123</Priority>
</SampleOutput>