Parser Error with an Extension containing Optional Block of Substatements

The following container definition which includes an extension with sub-statements is failing to parse.

container logrecords {
tailf:info "Shows logrecords information";
tailf:action show {

tailf:info "Shows the log records";
tailf:actionpoint logging-logrecord-show;

input {
leaf from

{ type yang:date-and-time; default 2000-01-01T00:00:00-00:00; description "Shows the log records from the given time"; }

leaf to

{ type yang:date-and-time; default 2099-01-01T00:00:00-00:00; description "Shows the log records up to the given time"; }

}
output {
leaf data

{ tailf:cli-drop-node-name; type string; description "Shows the log records according to the given input"; }

}
}
}

The problem is reported as follows:

[ERROR] yang-to-sources: Unable to parse yang files from /private/tmp/r/myartifactId/src/main/yang
org.opendaylight.yangtools.yang.parser.util.YangParseException:
Error in module 'atlas-logging' at line 241: missing '}' at 'tailf:actionpoint'
Error in module 'atlas-logging' at line 243: extraneous input 'input' expecting

{'}', 'when', 'uses', 'typedef', 'status', 'reference', 'presence', 'must', 'list', 'leaf-list', 'leaf', 'if-feature', 'grouping', 'description', 'container', 'config', 'choice', 'anyxml', IDENTIFIER}
Error in module 'atlas-logging' at line 255: extraneous input 'output' expecting {'}

', 'uses', 'typedef', 'status', 'reference', 'list', 'leaf-list', 'leaf', 'grouping', 'description', 'container', 'choice', 'anyxml', IDENTIFIER}