Update gms.md

linkedin · Feb 4, 2020 · 012c1ac · 012c1ac
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 Metadata for [entities](entity.md) [onboarded](../how/entity-onboarding.md) to [GMA](gma.md) is served through microservices known as Generalized Metadata Service (GMS). GMS typically provides a [Rest.li](http://rest.li) API and must access the metadata using [GMA DAOs](../architecture/metadata-serving.md). 
 
+While a GMS is completely free to define its public APIs, we do provide a list of [resource base classes](../../metadata-restli-resource/src/main/java/com/linkedin/metadata/restli) to leverage for common patterns.
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 GMA is designed to support a distributed fleet of GMS, each serving a subset of the [GMA graph](graph.md). However, for simplicity we include a single cenetralized GMS ([datahub-gms](../../gms)) that serves all entities.