decimal data type

You can declare your own Xsd simpleType in your schema
e.g
<simpleType name=’mydecimal’>
<restriction base=’decimal’>
<totalDigits value=’4’/>
<fractionDigits value=’3’/>
</restriction>
</simpleType>

Although, this just restricts content rather than enforcing how the decimal is represented
e.g. 2.3 and 0002.300 are both valid but 2.3004 would not be valid.

If it just a matter of the string format of a number this needs to be handled in a map with a script/custom functoid/extension that will produce the desired format

[code:1:0c4f73e536]Decimal.ToString(\"0000.000\")[/code:1:0c4f73e536]