Re: [xsl] Need an elegant (succinct) XPath expression to decode a 3-character field

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On 26/01/2024 16:01, Roger L Costello costello@xxxxxxxxx wrote:
> Hi Folks,
>
> My XML document contains an element named RNP (Required Navigation
Performance, which is the required performance of an aircraft, measured in
nautical miles).
> Its value is three digits, e.g.,
>
> <RNP>152</RNP>
>
> The value is encoded. I need an XPath expression which decodes it.
>
> If the first digit is non-zero, then the decoding is: the first two digits,
decimal point, the last digit.
> In the example above, the first digit is 1, so it is decoded to 15.2
>
> 152 -> decode -> 15.2
>
> (the aircraft's required performance is 15.2 NM).
>
> If the first digit is zero, then the decoding is: the third digit represents
the number of places to the right of the decimal point, e.g.,
> 010 -> decode -> 1
> 011 -> decode -> 0.1
> 012 -> decode -> 0.01
> 013 -> decode -> 0.001
> 014 -> decode -> 0.0001
> 015 -> decode -> 0.00001
> 016 -> decode -> 0.000001
> 017 -> decode -> 0.0000001
> 018 -> decode -> 0.00000001
> 019 -> decode -> 0.000000001


Looks like a mathematical operation

B  if (starts-with(., '0')) then xs:integer(substring(., 1, 2)) div
math:pow(10, xs:integer(substring(., 3))) else . div 10