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{{Code|basex:read-lock}} and {{Code|basex:write-lock}} options in the query prolog
→Option Declarations, Pragmas, Function Annotations
{{Mark|Introduced with Version 9.1}}: locks via pragmas and function annotations.
* You can declare custom read and write locks via options, pragmas or function annotations.
* The value of the lock may contain one or multiple lock keys (separated with commas).
* Similar to the internal database locks, write locks block all other operations while read locks allow parallel access.
* The internal locks and XQuery locks can co-exist (there will be no conflicts, even if your lock string equals the name of a database that will be locked by the transaction manager).
In the following module, lock annotations are used to prevent concurrent write operations on the same file:
