Discussion of 'Marked Spatial Point Processes: Current State and Extensions to Point Processes on Linear Networks' by Matthias Eckardt and Mehdi Moradi.

The article is a commentary on a review paper about recent developments in the field of spatial marked point processes. The review paper discusses two specific aspects: the extension of mark space to include functional marks, and the restriction of point locations to an underlying linear network. These developments expand point process theory and have various applications. The commentary suggests further developments, such as using random closed sets or geostatistical covariates as underlying spaces, and using compound mark functions instead of single marks. The commentary also mentions the use of different distance measures and the potential masking of interactions due to inhomogeneity. Overall, the review paper could benefit from clearer instructions for practical applications and defining edge-corrected estimators. [Extracted from the article]