Sub-texts, parts of original (ur-) texts. The signature and semantics matches those of UStorage.
The type of original texts.
The type of indexes of original texts.
refer t i j returns the part of t from i until j. The character pointed by j is not included in the result. If j is equal to i or located before j, the result is an empty string.
refer t i j
t
i
j
excerpt t copies the contents of t as a new ur_text.
excerpt t
context t returns the tuple (s, i, j) such that t = refer s i j.
context t
(s, i, j)
t = refer s i j
Conversion from indexes of sub-texts to ur_texts.