What Does Nullable = True or False means in XSD ?

Generally it's supposed to reflect the accompanying setting in the DB table (but nothing really happens if it doesn't match).  The DB column's setting will cause an error if a row write is attempted when that value is blank - for the XSD, i'm not aware of any difference it makes.

hi ,Klaus34  The nillable attribute of an element is retained. When a field with a null value is encountered, the element is not created. Null and empty strings in Appian have the same representation. We interpret a null/empty string in Appian as existing (non-null), but empty in terms of determining nillable.

The address is the same that you use in the browser.

Stefan Helzle said:

address is the same that you use in the browser.

AFAIK, community is not actually running in Appian, so won't really do anything if you try to connect to it from the Appian mobile app.  People wanting to interact here from mobile will need to just use a browser (and suffer through the mobile experience, which is pretty clumsy).

Hm ... do we mean Appian Community, or the Appian Community Edition?

Stefan Helzle said:

do we mean Appian Community, or the Appian Community Edition

good point, i was only going on the exact words they wrote (though i agree they could've been asking about CE - how to tell, though?)
"What is the server address to community ."