private void removeWrapperPrefixMapping(final String prefix) {
        LOGGER.trace("Removing prefix mapping {}, map contains {}", prefix, prefixToUriMap);
        prefixToUriMap.remove(prefix);
    }
Sets the locator to use when reporting errors.

@param locator The locator to use.
stroom-state/stroom-planb-impl/src/main/java/stroom/planb/impl/pipeline/PlanBFilter.java