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Module 7 More on XSLT Concepts Number Result tree fragment True unless the value is zero or NaN (not a number). Always true, because every fragment contains at least one node, its root node. Table 7.5: Boolean Conversion Rules Certain operators compare numerical values to arrive at a Boolean value. All the nodes in a node-set are tested to determine whether any of them satisfies the comparison or not. The Comparison operators are shown in table 7.6. Operator expr = expr expr != expr expr < expr expr > expr expr = expr Returns True if both expressions (string or numeric) have the same value, otherwise false. True if the expressions do not have the same value (string or numeric), otherwise false. True if the value of the first numeric expression is less than the value of the second, otherwise false. True if the value of the first numeric expression is greater than the value of the second, otherwise false. True if the value of the first numeric expression is less than or equal to the value of the second, otherwise false. True if the value of the first numeric expression is greater than or equal to the value of the second, otherwise false. Table 7.6: Comparison Operators Note: To use some of the comparison operators inside an XML document such as an XSLT style sheet or a schema, one must use character references < and > instead of < and >. The different functions that return Boolean functions are shown in table 7.7. Function expr and expr expr or expr true() false() not(expr) Returns True if both Boolean expressions are true, otherwise false. True if at least one Boolean expression is true, otherwise false. True. False. Negates the value of the Boolean expression: true if the expression is false, otherwise false. Table 7.7: Boolean Functions Version 1.0 © Aptech Limited XML Simplified
Module 7 More on XSLT 7.2.5 Numeric Functions XPath syntax supports number functions that return strings or numbers and can be used with comparison operators in filter patterns. The different numeric functions are number(arg), ceiling(num), floor(num) and round(num). Concepts The rules for converting any expression into a numeric value are listed in table 7.8. Expression Type Node-set Boolean String Result-tree fragment Rule The first node is converted into a string, then the string conversion rule is used. The value true is converted to the number 1, and false to the number 0. If the string is the literal serialization of a number (i.e., -123.5), it is converted into that number. Otherwise, the value NaN is used. Like node-sets, a result-tree fragment is converted into a string, which is then converted with the string rule. Table 7.8: Expressions into Numbers Conversion Rules To manipulate numeric values, there are a variety of operators and functions as shown in table 7.9. Function expr + expr expr - expr expr * expr expr div expr expr mod expr round(expr) sum(node-set) Returns The sum of two numeric expressions. The difference of the first numeric expression minus the second. The product of two numeric expressions. The first numeric expression divided by the second expression. The first numeric expression modulo the second expression. The value of the expression rounded to the nearest integer. The sum of the values of the nodes in node-set. Unlike the other functions in this table, this function operates over a node-set instead of expressions. Table 7.9: Numeric Operators and Functions XML Simplified Version 1.0 © Aptech Limited
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XML Simplified
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Aptech New Products Design Model 1
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Table of Contents Sessions 1. Intro
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Module 1 Introduction to XML Markup
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Module 2 Namespaces Module Overview
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