boolean() 으로 특정 element를 조회하면 될 듯?
[링크 : https://stackoverflow.com/questions/5689966/how-to-check-if-an-element-exists-in-the-xml-using-xpath]
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2019.12.17
옛날 글이라 그런가 링크가 깨졌네
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The boolean function converts its argument to a boolean as follows:
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a number is true if and only if it is neither positive or negative zero nor NaN
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a node-set is true if and only if it is non-empty
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a string is true if and only if its length is non-zero
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an object of a type other than the four basic types is converted to a boolean in a way that is dependent on that type
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[링크 : https://stackoverflow.com/questions/5689966/how-to-check-if-an-element-exists-in-the-xml-using-xpath]
[링크 : http://www.w3.org/TR/xpath/#function-boolean] << 옛날 링크
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The function computes the effective boolean value of a sequence, defined according to the following rules. See also Section 2.4.3 Effective Boolean Value XP31.
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If $arg is the empty sequence, fn:boolean returns false.
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If $arg is a sequence whose first item is a node, fn:boolean returns true.
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If $arg is a singleton value of type xs:boolean or a derived from xs:boolean, fn:boolean returns $arg.
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If $arg is a singleton value of type xs:string or a type derived from xs:string, xs:anyURI or a type derived from xs:anyURI, or xs:untypedAtomic, fn:boolean returns false if the operand value has zero length; otherwise it returns true.
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If $arg is a singleton value of any numeric type or a type derived from a numeric type, fn:boolean returns false if the operand value is NaN or is numerically equal to zero; otherwise it returns true.
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[링크 : https://www.w3.org/TR/xpath-functions-31/#func-boolean] << 새로운 링크?
