Subject: [xsl] Need an elegant (succinct) XPath expression to decode a 3-character field From: "Roger L Costello costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 26 Jan 2024 15:00:49 -0000 |
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 I created an XPath expression which seems to do the decoding correctly. See below. It is an awful, brute force solution. Is there an elegant (succinct) solution? if (substring(RNP,1,1) ne '0') then concat(substring(RNP,1,2),'.',substring(RNP,3,1)) else if (substring(RNP,1,1) eq '0') then if (substring(RNP,3,1) eq '0') then substring(RNP,2,1) else if (substring(RNP,3,1) eq '1') then concat('0.',substring(RNP,2,1)) else if (substring(RNP,3,1) eq '2') then concat('0.0',substring(RNP,2,1)) else if (substring(RNP,3,1) eq '3') then concat('0.00',substring(RNP,2,1)) else if (substring(RNP,3,1) eq '4') then concat('0.000',substring(RNP,2,1)) else if (substring(RNP,3,1) eq '5') then concat('0.0000',substring(RNP,2,1)) else if (substring(RNP,3,1) eq '6') then concat('0.00000',substring(RNP,2,1)) else if (substring(RNP,3,1) eq '7') then concat('0.000000',substring(RNP,2,1)) else if (substring(RNP,3,1) eq '8') then concat('0.0000000',substring(RNP,2,1)) else concat('0.00000000',substring(RNP,2,1)) else ''
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