final ExternalSpreadsheetCompiler converter = new ExternalSpreadsheetCompiler();
//the data we are interested in starts at row 2, column 2 (e.g. B2)
String drl = null;
try {
drl = converter.compile(getSpreadsheetStream(), getRulesStream(), 2, 2);
} catch (IOException e) {
throw new IllegalArgumentException("Could not read spreadsheet or rules stream." ,e);
}
//compile the drl