[OE-core] what is the purpose of "DISTRO =" *inside* a distro conf file?

[Robert P. J. Day]

  perusing the distro conf files in the meta-yocto layer and noticed
that all of them have a line of the form

  DISTRO = "poky-lsb"

or what have you. what is the purpose of that line inside the distro
conf file of the same name? is it required?

rday

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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