XSLT transforming name value pairs to its corresponding XML - xslt

Question

I am new to XSLT I am trying to transform a name value pair to its corresponding XML. This feature is primarily used in case of special extensions to a standard.
The file I want to transform is the following. There are no spaces expected in any of the extNames.
<?xml version="1.0" encoding="UTF-8"?>
<extensionItems xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ExtensionItems.xsd">
<extensionsItem>
<extName> callCode</extName>
<extValue>1</extValue>
<extType>integer</extType>
</extensionsItem>
<extensionsItem>
<extName>callbackType</extName>
<extValue>All</extValue>
<extType>string</extType>
</extensionsItem>
<extensionsItem>
<extName>callbackEmail</extName>
<extValue>me#mine.org</extValue>
<extType>string</extType>
</extensionsItem>
</extensionItems>
to the following:
<ODEventNotificationExtraField>
<callCode> 1</callCode>
<callbackType> All </callbackType>
<callbackEmail> me#mine.org </callbackEmail>
</ODEventNotificationExtraField>

Answer 1

The following stylesheet produces the desired result:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/>
<xsl:template match="extensionItems">
<ODEventNotificationExtraField>
<xsl:apply-templates/>
</ODEventNotificationExtraField>
</xsl:template>
<xsl:template match="extensionsItem">
<xsl:element name="{extName}">
<xsl:value-of select="extValue"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>