public static String getDataTypePattern(String datatypeKey)
    {
    	Datatype datatype = getDatatype(datatypeKey);
    	return datatype.getPattern();
    }
public static String getDataTypePattern ( String datatypeKey ) { Datatype datatype = getDatatype ( datatypeKey ) ; return datatype . getPattern ( ) ; }
Retrieves the pattern (regular expression) used by the identifiers within a data type.

@param datatypeKey data type ID, name (or synonym), or URI (URL or URN)
@return pattern of the data type

@throws IllegalArgumentException when datatype not found