libxml2-2.7.7/result/XPath/expr/functions

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Expression: true()
Object is a Boolean : true

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Expression: false()
Object is a Boolean : false

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Expression: number("1.5")
Object is a number : 1.5

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Expression: number('abc')
Object is a number : NaN

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Expression: -number('abc')
Object is a number : NaN

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Expression: floor(0.1)
Object is a number : 0

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Expression: floor(-0.1)
Object is a number : -1

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Expression: floor(-0)
Object is a number : 0

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Expression: floor(0)
Object is a number : 0

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Expression: floor(5.2)
Object is a number : 5

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Expression: floor(-5.2)
Object is a number : -6

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Expression: ceiling(0.1)
Object is a number : 1

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Expression: ceiling(-0.1)
Object is a number : 0

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Expression: ceiling(-0)
Object is a number : 0

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Expression: ceiling(0)
Object is a number : 0

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Expression: ceiling(5.2)
Object is a number : 6

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Expression: ceiling(-5.2)
Object is a number : -5

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Expression: round(0.1)
Object is a number : 0

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Expression: round(5.2)
Object is a number : 5

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Expression: round(5.5)
Object is a number : 6

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Expression: round(5.6)
Object is a number : 6

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Expression: round(-0.1)
Object is a number : 0

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Expression: round(-5.2)
Object is a number : -5

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Expression: round(-5.5)
Object is a number : -5

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Expression: round(-5.6)
Object is a number : -6