In this case 'text-based' is a synonym for 'discourse-based'.

(My Ph.D. dissertation was on discourse-based constructs in translation. Newmeyer was one of my references.)

Examples of 'discourse-based construct':

files.eric.ed.gov/fulltext/ED399809.pdf‎
by WJ Greyling - ‎1995 - ‎Cited by 5 - ‎Related articles
**discourse-based construct system** for predicting the occurrence of distinct ... discourse-based construct system in generating if-then predictions for accuracy- and ...

Language Form and Language Function
books.google.com/books?isbn=0262640449
Frederick J. Newmeyer - 2000 - ‎Language Arts & Disciplines
... of arbitrariness would entail the claim that any syntactic construct in any language is replaceable in principle by a **semantic or discourse-based construct**.

A Guide to Morphosyntax-phonology Interface Theories: How ...
books.google.com/books?isbn=3110238624
Tobias Scheer - 2011 - ‎Language Arts & Disciplines
... does not select for semantic values, and conversely that a particular **semantic or discourse-based construct** may map onto various syntactic structures.

[In the following example, it looks as if the authors paraphrased Newmeyer]

Drawing the Boundaries of Meaning: Neo-Gricean studies in ...
books.google.com/books?isbn=9027293058
Betty J. Birner, ‎Gregory Ward - 2006 - ‎Language Arts & Disciplines
It is easy to find examples of the converse situation as well, that is, where a particular **semantic or discourse-based construct maps** onto a multitude of syntactic ...

Peer Edition in EFL Writing_Asia TEFL 2013 - SlideShare
www.slideshare.net/.../asia-tefl-2013susilo-universitas-mul...‎
Oct 29, 2013 - DATA ANALYSIS  The data were then analyzed by using a **discourse-based construct** which involved explicit interpretation of the meaning and ...