<commit_before>#Service Access Layer
The service access layer is to cooperate each service entity to communicate with others via REST APIs.

###Data Service

    d(resource, method, params, callback)

###Application Service
    app(resource, method, session, params, callback)

###Presence Service
    prs(resource, method, session, params, callback)

###Communication Service
    comm(resource, method, session, params, callback)<commit_msg>Update document of service access layer<commit_after>#Service Access Layer
The service access layer is to cooperate each service entity to communicate with others via REST APIs.

###Data Service Access

    d(resource, method, params, callback)

###Application Service Access
    app(resource, method, session, params, callback)

###Presence Service Access
    prs(resource, method, session, params, callback)

###Communication Service Access
    comm(resource, method, session, params, callback)
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{'dir': 'git-commits-cleaned', 'id': '602126', 'n_tokens_mistral': 238, 'n_tokens_neox': 224, 'n_words': 102}