Caedmon continues his praising with this descriptive appositive,
a noun phrase following another word or phrase that continues to
describe or identify it. For example, if you were to say, "Harry Potter,
the boy-wizard," it's clear that "boy-wizard" is a further description
or appositive of the first word, "Harry Potter." In this case, line 2 is
continuing the description of "heaven-kingdom's Guardian" in the first
Caedmon describes God in another metaphor as a kind of architect, a "Measurer" whose power is exercised through something
called "mind-plans." These might just be "thoughts," but the addition of
"plans" in this kenning makes them seem more architectural, like God is
doodling with a compass in his head, figuring out the circumference of
the world, the depths of the oceanic basins, the height of the sky—you
know, the easy stuff.
There sure are a lot of M's here. What's the effect of putting three M-sounds in a single line? For Anglo-Saxon
poets, alliteration was a way of organizing the line around its four
stresses and that big space in the middle. For more on how alliteration
became a calling card for all major Anglo-Saxon poetry, see "Form and Meter." And look out for more alliterating words below!