An XSLT that's just a little more Specific

[Jose Campana]

Hello There !

I'm digging deeply into the world of XSL Transformations. I have done some cool things. But I feel sometimes I just need a little push to get me going.
I'm a little sorry to be so Direct, But, I'd like to know How would you do the following Transformation?

Given this XML:

<?xml version="1.0" encoding="UTF-8"?>
<p:MessageIn xsi:type="p:MessageIn"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://Transaction">
 <messageBody>
    <fieldName length="17" format="number" alignment="right" fillChar="0">accountNumber1</fieldName>
    <value>220000003</value>
    <required>true</required>
 </messageBody>
</p:MessageIn>

How can I turn it into this:

00000000220000003

The Key to note here is that given the value which is 220000003, I need to apply the length and alignment attributes. and that's it. Easier said than done, right?
I'm honest when I say I have no clue.

Could you please help me. Like I said, I need a little something that shows me the way.

Thanks in advance.

Your Friend,

Jose

[Paul Clapham]

A recursive template.

If the length of the value is equal to the specified length, just return the value.

If the length of the value is less than the specified length, then return the result of applying the template to the value with one instance of the fill character appended at the appropriate end of the value.

If the length is greater... let me leave that for now.

[Jose Campana]

Hello Mr Paul.

Like I said, easier said than done.

Could you please at least show me the basic structure of how a recursive template looks like?

Please Please Please.....

Sincerely,

Jose

[Paul Clapham]

All very ordinary XSLT (written in 1 minute or less so not necessarily correct syntax or logic):

<xsl:template name="pad">
<xsl:param name="value">
  <xsl:choose>
  <xsl:when test="something">
    <xsl:value-of select="$value"/>
  </xsl:when>
  <xsl:otherwise>
    <xsl:call-template name="pad">
    <xsl:with-param name="value" select="concat('0', $value)"/>
    </xsl:call-template>
  </xsl:otherwise>
</xsl:template>

[Jose Campana]

Hello, Mr. Paul,

Thank you for the advice and proper sample you've showed me. I wanted to reply earlier, but the forum kept failing for repeated occasions when I submitted my responses.
So, I'll take it from there, and see what I can do.

Thank you very much,

Sincerely,

Jose.