Halliday & Matthiessen (2014: 607):
… the cohesive selections in a text form logogenetic patterns. In the case of conjunction, such patterns take the form of favoured selections of logico-semantic relations for developing the text rhetorically. In the case of the other types of cohesive resources, such patterns take the form of logogenetic chains – chains of reference, ellipsis and lexical cohesive links, and of interactions among such chains within and across different types of cohesion.
Blogger Comments:
To be clear, this confuses paradigm (choice) with syntagm (chain): logogenetic patterns are patterns of paradigmatic choices, whereas chains link items syntagmatically.