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<SpqlQuery> ::= (<SqlQuery>| <MineQuery> | <Discretize>)
<MineQuery> ::=<Header><br><SqlQuery><br><MiningDefinition><br><Constraints>
<Header> ::= MINE PATTERNS WITH SUPP >= <Number>
<MiningDefinition> ::= TRANSACTION <Transaction><br> ITEM
<Item><br>[ ATTRIBUTE <Attribute>]
<Transaction> ::= <Field>[<Separator><Transaction>]
<Item> ::= <Field>[<Separator><Item>]
<Attribute> ::= <Field>[<Separator><Attribute>]
<Field> ::= <String>.<String>
<Constraints> ::= CONSTRAINED BY <Function>
<Function> ::= (<FunctionM>(<Field>)<Op><Number> | <FunctionS>(<Field>)<Op><Set> |
<FunctionN>()<Op><Number> ) [<Separator>(Function)]
<FunctionM> ::= (Minimum | Maximum | Range | Variance | Std_Deviation | Median | Average | Sum)
<FunctionS>::= (Subset_of | Superset_of | Attribute_Subset_of | Attribute_Superset_of )
<FunctionN>::= Length
<Op> ::= (>|<|>=|<=)
<Separator> ::= ,
<br> ::= \n
<Set> ::= <String>[<Separator><Set>]
<Discretize>::= DISCRETIZE <Field> AS <Field> <br> FROM <String> <br> IN
(<Method>| <Intervals>) BINS <br> SMOOTINGH BY <Smethod>
<Method> ::= (EQUALWIDTH | EQUALDEPTH)
<Smethod> ::= (AVERAGE | COUNT | BIN BOUNDARIES)
<Intervals>::= (<Number> <Separator> <Number>)[<Separator> <Intervals>]
<Number> ::= (0-9) [<Number>]
<String> ::= (a-z|A-Z|0-9) [<String>]
Table 2: A portion of spql formal grammar definition.
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