The JUNOScript server includes the xmlns:junos attribute in the opening <rpc-reply> tag to define the XML namespace for the enclosed JUNOS XML tag elements that have the junos: prefix on their names. The namespace is a URL of the form http://xml.juniper.net/junos/release-code/junos, where release-code is the standard string that represents the release of the JUNOS software running on the JUNOScript server machine.
In the following example, the namespace corresponds to the initial version of JUNOS Release 9.4:
<rpc-reply xmlns:junos="http://xml.juniper.net/junos/9.4R1/junos">