Developer note:
 To extend this SQLQuerySourceWriter for another
 org.eclipse.datatools.modelbase.sql.query package, the following naming
 conventions have to be adhered to. The package name containing the
 SQLQueryObjects must contain the part name
 sql.query, e.g. org.eclipse.datatools.modelbase.sql.query.db2.luw.
 The SQLQuerySourceWriter for that package must be under the sub-
 package util, likewise
 org.eclipse.datatools.modelbase.sql.query.db2.luw.util
 The name of the SQLQuerySourceWriter class must be composed of
 at least the last part of the SQLQueryObjects' package name and
 the word "SourceWriter", e.g. for an SQLQueryObject in package
 org.eclipse.datatools.modelbase.sql.query.db2.luw the appropriate
 SQLQuerySourceWriter class could be
 org.eclipse.datatools.modelbase.sql.query.db2.luw.util.DB2LUWSourceWriter or
 org.eclipse.datatools.modelbase.sql.query.db2.luw.util.LUWSourceWriter. The
 SQLQuerySourceWriter could also be capable of generatiing the
 SQL source text of multiple SQLQueryObjects' packages and
 consequently would have to be located in a higher package itself. Likewise
 a org.eclipse.datatools.modelbase.sql.query.db2.util.DB2SourceWriter could be
 capable of generatiing the SQL source text for the packages
 org.eclipse.datatools.modelbase.sql.query.db2 and
 org.eclipse.datatools.modelbase.sql.query.db2.luw and
 org.eclipse.datatools.modelbase.sql.query.db2.zos and
 org.eclipse.datatools.modelbase.sql.query.db2.cloudscape.
 
 
 There can be only one SQLQuerySourceWriter per
 SQLQueryObject package!
 
 
 A SQLQuerySourceWriter operates on interface level
 
 Developer note: add only appendSQL methods that apply
 to specific SQLQueryObjects so the runtime type will decide its invocation,
 an invokation of appendSQL() should always be compiletime-bound to
 appendSQL(SQLQueryObject, StrinBuffer) that via reflection then invokes the
 right appendSQL method. Unless: you know the exact runtime type and this type
 has no subtypes with special features or source generation, that are
 formatted by another appendSQL method here