* @throws UnknownDescriptionException
*/
private VerifierFromDescr visitFromDescr(FromDescr descr) throws UnknownDescriptionException {
VerifierFromDescr from = new VerifierFromDescr(pattern);
VerifierComponent ds = visit(descr.getDataSource());
from.setDataSourcePath(ds.getPath());
from.setDataSourceType(ds.getVerifierComponentType());
from.setParentPath(rule.getPath());
from.setParentType(rule.getVerifierComponentType());
data.add(from);