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You cannot either see the non-value field on the form or input value for them. Its value will be automatically created or defined when you are managing templates.
String[] hiddenField1 = ["jcrPath=/node/jcr:content", "nodetype=nt:resource", "mixintype=dc:elementSet", "visible=false"] ;
uicomponent.addHiddenField("hiddenInput1", hiddenField1) ;