Fix: if your want to calculate numbers, you need numbers, see #6

add/data/xql/getMeasures.xql

@@ -66,11 +66,11 @@ declare function local:getMeasures($mei as node(), $mdivID as xs:string) as xs:s
                 let $partMeasures := $part//mei:measure[not(parent::mei:del)][
                     if (contains(@label, '–'))
                     then (
-                        substring-before(functx:substring-before-if-contains(functx:substring-after-if-contains(@label, '('), ')'), '–') <= $mentionedMeasureLabel and 
-                        substring-after(functx:substring-before-if-contains(functx:substring-after-if-contains(@label, '('), ')'), '–')  >= $mentionedMeasureLabel
+                        number(substring-before(functx:substring-before-if-contains(functx:substring-after-if-contains(@label, '('), ')'), '–')) <= number($mentionedMeasureLabel) and 
+                        number(substring-after(functx:substring-before-if-contains(functx:substring-after-if-contains(@label, '('), ')'), '–'))  >= number($mentionedMeasureLabel)
                     )
                     else (
-                        functx:substring-before-if-contains(functx:substring-after-if-contains(@label, '('), ')') = $mentionedMeasureLabel
+                        number(functx:substring-before-if-contains(functx:substring-after-if-contains(@label, '('), ')')) = number($mentionedMeasureLabel)
                     )
                 ]
                 return