Common Gotchas for map to xml

An adhoc set of errors encountered when using map-to-xml, and how to fix them

Unquoted filters

FILTER (roadno = 'A55'). Rewrite as FILTER ("roadno" = 'A55')

IS NULL filter statements

FILTER ("type3_usrn" is null). Rewrite as FILTER ("type3_usrn" =NULL). Similarly is not null becomes !=NULL

NOT filter statements

FILTER ("roadno" not like 'C%'). Rewrite as FILTER (not("roadno" like 'C%'))