To expand on the comment above, "xref:ds-introduction.adoc[Introduction]" could constitute as an assembly itself:

_partials/attributes.adoc

_partials/data-sync/introducing-data-sync.adoc

_partials/data-sync/data-sync-technical-overview.adoc

_partials/data-sync/ref_terminology.adoc

Additional resources
Learn GraphQL

Voyager Server GitHub repository

Voyager Client GitHub repository

Apollo Server

Apollo Client