Question regarding subselect

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,

I have a question regarding subselects, as the feature has been discussed,
before I joined the WG.

If we do not add any features such as aggregates, scalar expressions, assignment
or similar - do subselects add anything to the expressiveness of the language?
All examples in the wiki include at least one such additional feature.

Typical uses such as FORALL or EXISTS should be possible in the current version
of SPARQL using a combination of OPTIONAL, BOUND filters and perhaps DISTINCT, I
think.

I would like to understand better the implications of adding subselects and in
particular dependencies with other features.

Best regards,
Simon
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkn5gecACgkQQ0Lz1fXAQeMWAwCfXH5XxLBeP1Q/UwM2pIY+z4gv
4/UAnjywNXTTq7PuCnl5kiSmsoB1iyzJ
=twi5
-----END PGP SIGNATURE-----