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Expression: string(5)
Object is a string : 5

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Expression: string(0.5)
Object is a string : 0.5

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Expression: string(-0.5)
Object is a string : -0.5

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Expression: string(true())
Object is a string : true

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Expression: string(false())
Object is a string : false

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Expression: concat("titi","toto")
Object is a string : tititoto

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Expression: concat("titi","toto","tata")
Object is a string : tititototata

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Expression: starts-with("tititoto","titi")
Object is a Boolean : true

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Expression: starts-with("tititoto","to")
Object is a Boolean : false

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Expression: contains("tititototata","titi")
Object is a Boolean : true

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Expression: contains("tititototata","toto")
Object is a Boolean : true

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Expression: contains("tititototata","tata")
Object is a Boolean : true

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Expression: contains("tititototata","tita")
Object is a Boolean : false

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Expression: substring("12345",2,3)
Object is a string : 234

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Expression: substring("12345",2)
Object is a string : 2345

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Expression: substring("12345",1.5,2.6)
Object is a string : 234

========================
Expression: substring("12345",0,3)
Object is a string : 12

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Expression: string-length("")
Object is a number : 0

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Expression: string-length("titi")
Object is a number : 4