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function evaluateBoolean(expression, context) {
let doc = context.ownerDocument || context;
return doc.evaluate(expression, context, null, XPathResult.BOOLEAN_TYPE, null).booleanValue;
}
function evaluateNumber(expression, context) {
let doc = context.ownerDocument || context;
return doc.evaluate(expression, context, null, XPathResult.NUMBER_TYPE, null).numberValue;
}
function evaluateString(expression, context) {
let doc = context.ownerDocument || context;
return doc.evaluate(expression, context, null, XPathResult.STRING_TYPE, null).stringValue;
}
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