From the section 8.2.5 URL and 8.10.2 URL and Links we understand that we can show Other Enterprise Manager pages from our plug-in. But we could n't find any working examples. The document says that "The reference guide includes a complete list in the oracle.sysman.emx.Constants class of all page constants available and the corresponding parameters that must be specified to produce a URL.". But We could only find Constants.PAGE_AVAILABILITY constant in the Constants which is related with pages (Some other constants are there in the Constants class like AVAIL_AGENT_DOWN, JOB_REASSIGNED_STATUS. But those are not related to any page.)
Our question is it possible to show the Enterprise > Provisioning and Patching > Baremetal Provisioning page as per the above documentation.
UrlEm is for URL's that are supported via PAGE_ constants in the oracle.sysman.emx.util.Constants class. The pages that you are asking about do not currently have constants defined for them. You can use UrlRel to access them instead, however please be aware that they are subject to change (though very unlikely). What you would do is this:
var url:UrlRel = new UrlRel("/faces/core-bmp-dashboard", null); // link to Bare Metal Provisioning
The others are "/faces/db-provisioning-dbProvConsole" for Database Provisioning and "/faces/emas-fmwprov-fmwProvConsole" for Middleware Provisioning.