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| '''Summary'''
|Returns the system property, specified by {{Code|$name}}, or a context parameter with that name (see [[Web_Application#Configuration|Web Applications]]). An empty sequence is returned if the property does not exist. For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-environment-variable fn:environment-variable].
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| '''Examples'''
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| '''Summary'''
|Returns the names of all Java system properties and context parameters (see [[Web_Application#Configuration|Web Applications]]). For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-available-environment-variables fn:available-environment-variables].
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| '''Examples'''
