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13.44. Queries Calling Other Queries
Queries can call other queries. This combined with optional query arguments provides derivation query style backward chaining. Positional and named syntax is supported for arguments. It is also possible to mix both positional and named, but positional must come first, separated by a semi colon. Literal expressions can be passed as query arguments, but you cannot mix expressions with variables.
Note
Using the '?' symbol in this process means the query is pull only and once the results are returned you will not receive further results as the underlying data changes.
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