Google's proposal for filtering: https://google.aip.dev/160 https://google.aip.dev/160 Specifically, https://google.aip.dev/assets/misc/ebnf-filtering.txt http

Google's proposal for filtering: https://google.aip.dev/160 https://google.aip.dev/160 Specifically, https://google.aip.dev/assets/misc/ebnf-filtering.txt https://google.aip.dev/assets/misc/ebnf-filtering.txt which is a modification of their common expression language https://github.com/google/cel-spec https://github.com/google/cel-spec