anīlke
This is the word for the attribute written or having to do with writing. The phrase
jāxīsse jīlke then refers to the writing line, the boundary line that runs through the script.
temme ē jaþēλi ien jakā ānen ansāorīki ien jaxūna ānen anrūēli ī xiēn jē jāxīsse jīlke ī jāo ja la sūjatā ē jāo sūjōl ien jiēxa ānen jasēsi ī jōrrisi ē jatatēn ien ñi jīlkena cē jaþārre ōrra ē jawāññerāñi jīþi nā ī;
xiēn jē jāxīsse jīlke ī jāo ja la sūjatā ē jāo sūjōl then is ‘concerning the writing line and that which is beneath it and that above it’.
He said to him the ideas: the doings of consonants; the pattern of vowels, and also concerning the writing line and that which is beneath it and that above it; …