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The - operator performs subtraction.
NOTE: Since XML allows - in names, the - operator typically needs to be preceded by whitespace. For example, foo-bar evaluates to a node-set containing the child elements named foo-bar; foo - bar evaluates to the difference of the result of converting the string-value of the first foo child element to a number and the result of converting the string-value of the first bar child to a number.
Interactive xlab: [xsl:value-of] [xsl:template]