The guidelines currently don't provide recommendations for streaming data.

• For raster, Cloud Optimized GeoTIFF (COG) is a promising candidate. However, it is not yet certified as archival format.
• For vector data, the best streaming format candidate (e.g. GeoParquet, flatgeobuf, GeoFeather, vector tiles) is still undecided. However, using streaming formats could also be helpful to make it easier to access archived data.

See also:

• GEO_33 Rationale - Map Styling / SLD Limitations #50
• Consideration of streaming data sources & OGC API #45