[opensuse-packaging] Where is find_lang documented?

Where is %find_lang documented? What parameters does it take and what does it do? I am not looking for cargo cult programming examples, but real documentation. google is useless it gives the address of a gazzilion spec files that use it. Why is it that packaging can only be learned as folklore? -- Paul Elliott 1(512)837-1096 pelliott@BlackPatchPanel.com PMB 181, 11900 Metric Blvd Suite J http://www.free.blackpatchpanel.com/pme/ Austin TX 78758-3117