Dosdp schema is updated to support 0-many var inputs. With this schema update given supports are added:

• Internal vars added to apply basic operations (such as join and regex) on data_list_vars and introduce new variables.
• Multi_clause structure added to support optional clauses
• Utilization of clauses and data_list_vars/list_vars together to support cardinality > 1 cases

Related YAML decoder and OWL generator codes need to be implemented.