Non-restrictive relative clauses seem to be either indicated by a prosodic break before and after the relative clause and a short head nod on the relative clause. Alternatively, they may be introduced by manual connector such as, for example, thus.
Sina Proske, Derya Nuhbalaoglu, Annika Herrmann, Jana Hosemann & Markus Steinbach
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The entire grammar:
Branchini, Chiara and Lara Mantovan (eds.). 2020. A Grammar of Italian Sign Language (LIS). 1st ed. (SIGN-HUB Sign Language Grammar Series). (http://sign-hub.eu/grammars/...) (Accessed 31-10-2021)
A Chapter:
Smith, Mary. 2020. Syntax: 3. Coordination and Subordination. In Branchini, Chiara and Lara Mantovan (eds.), A Grammar of Italian Sign Language (LIS). 1st ed. (SIGN-HUB Sign Language Grammar Series), 230-237. ((http://sign-hub.eu/grammars/...) (Accessed 31-10-2021)
A Section:
Smith, Mary. 2020. Phonology: 1.1.1.2. Finger configuration. In Mary, Smith, Ben Smith and Carlo Smith (eds.), A Grammar of Catalan Sign Language (LSC). 1st ed. (SIGN-HUB Sign Language Grammar Series), 230-237. (http://sign-hub.eu/grammars/...) (Accessed 31-10-2021)
Smith, Mary. 2020. Syntax: 3.1.2.1.3. Manual markers in disjunctive coordination. In Mary, Smith, Ben Smith and Carlo Smith (eds.), A Grammar of Catalan Sign Language (LSC). 1st edn. (SIGN-HUB Sign Language Grammar Series), 230-237. (http://sign-hub.eu/grammars/...) (Accessed 31-10-2021)
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant Agreement No 693349.