Biztalk Map node validation - xslt

Question

I'm mapping home, work and mobile number nodes from the source schema to the home, work and mobile node in the destination schema.
I need to ensure that the data matches destination pattern (No space, punctuation, leading zeros, matching [+0][0-9]*. Can this be achieved via XSLT?
Source
<HTelephone>01656 123 123</HTelephone>
<WTelephone>01656-123-123</WTelephone>
<MTelephone>[phone]</MTelephone>
Destination
<HTelephone>01656123123</HTelephone>
<WTelephone>01656123123</WTelephone>
<MTelephone>[phone]</MTelephone>
Current Inline XSLT Call Template
<xsl:template name="MNo" xmlns:msxsl="urn:schemas-microsoft-com:xslt" >
<xsl:param name="inTelNo"/>
<xsl:element name="MTelephone" >
<xsl:value-of select="concat('+', translate($inTelNo, translate($inTelNo,'0123456789',''), ''))"/>
</xsl:element>
We need to validation the first character to allow a 0 or + also, any ideas?

Answer 1

Assuming correct input ( a root element to make it well-formed XML) use the concat() and translate functions to change the strings.
Input
<?xml version="1.0" encoding="utf-8"?>
<root>
<HTelephone>01656 123 123</HTelephone>
<WTelephone>01656 123 123</WTelephone>
<MTelephone>01656 123 123</MTelephone>
</root>
Stylesheet
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<xsl:output method="xml" version="1.0" encoding="utf-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="/root">
<xsl:copy>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>
<xsl:template match="root/*">
<xsl:copy>
<xsl:value-of select="concat('+',translate(.,' ',''))"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Output
<?xml version="1.0" encoding="utf-8"?>
<root>
<HTelephone>+01656123123</HTelephone>
<WTelephone>+01656123123</WTelephone>
<MTelephone>+01656123123</MTelephone>
</root>