type Query {
    """Access a repository by reference/name. If no ref is given, the default repository is returned if any."""
    repository(ref: String): Repository
}

type Mutation {
    """Create a new bug"""
    newBug(input: NewBugInput!, txId: TxId): NewBugPayload!
    """Add a new comment to a bug"""
    addComment(input: AddCommentInput!, txId: TxId): AddCommentPayload!
    """Add or remove a set of label on a bug"""
    changeLabels(input: ChangeLabelInput!, txId: TxId): ChangeLabelPayload!
    """Change a bug's status to open"""
    openBug(input: OpenBugInput!, txId: TxId): OpenBugPayload!
    """Change a bug's status to closed"""
    closeBug(input: CloseBugInput!, txId: TxId): CloseBugPayload!
    """Change a bug's title"""
    setTitle(input: SetTitleInput!, txId: TxId): SetTitlePayload!

    """Start a transaction.
    If a transaction ID if passed to the mutation, operation are accumulated
    in memory until a commit happen.
    """
    startTransaction(input: StartTransactionInput!): StartTransactionPayload!
    """Commit a transaction. All mutation linked to this transaction are written on disk."""
    commit(input: CommitInput!): CommitPayload!
    """Rollback a transaction. Alll mutationlinked to this transaction are discarded."""
    rollback(input: RollbackInput!): RollbackPayload!
}