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==proc:property-names==
{{Mark|Introduced with Version 8.3:}}
|-
| width='120' | '''Signatures'''
|{{Func|proc:property-names|$name as xs:string|xs:string*?}}<br/>
|-
| '''Summary'''
|Returns the names of all Java system propertiesproperty specified by {{Code|$name}}. 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-available-environment-variables variable fn:available-environment-variablesvariable].
|-
| '''Examples'''
|
* {{Code|map:merge(proc:property-names() ! map:entry('java.runtime, proc:property(.version')))}} returns the version of the Java runtime enginea map with all system properties.
|}
==proc:property-names==
{{Mark|Introduced with Version 8.3:}}
|-
| width='120' | '''Signatures'''
|{{Func|proc:property-names|$name as xs:string|xs:string?*}}<br/>
|-
| '''Summary'''
|Returns the names of all Java system property specified by {{Code|$name}}. An empty sequence is returned if the property does not existproperties. For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-available-environment-variable variables fn:available-environment-variablevariables].
|-
| '''Examples'''
|
* {{Code|map:merge(proc:property-names() ! map:entry('java., proc:property(runtime.))version')}} returns a map with all system propertiesthe version of the Java runtime engine.
|}
