2. The method of claim 1 further comprising: ingesting a first set of passages from the first set of sources into the first corpus; selecting a second set of passages from the second set of sources, wherein the selection is based on each of the second set of passages being an update to at least one of the first set of passages; and ingesting the selected second set of passages into the second corpus.
2. The method of claim 1 further comprising: ingesting a first set of passages from the first set of sources into the first corpus; selecting a second set of passages from the second set of sources, wherein the selection is based on each of the second set of passages being an update to at least one of the first set of passages; and ingesting the selected second set of passages into the second corpus. 3. The method of claim 2 wherein the ingestion into the first corpus is performed on a first ingestion cycle and the ingestion into the second corpus is performed on a second ingestion cycle, wherein the first ingestion cycle occurs less frequently than the second ingestion cycle, and wherein the method further comprises: including unselected passages from the second set of sources in a data store; and ingesting the unselected passages into the first corpus during a next first ingestion cycle.