### Instruction:

Extract the cause and effect entities from the following sentence:
XMPP URLs resemble those of emails, and, like emails, it is possible to keep messages in a storage memory when an endpoint is offline

### Assistant:

VARIABLE: messages
CONDITION: in a storage memory
CAUSE_1: an endpoint is offline
EFFECT_1: to keep messages in a storage memory
KEYWORD: it is possible
NOT_RELEVANT: XMPP URLs resemble those of emails, and, like emails

