It is up to those involved in the struggle to decide what is acceptable but it seems reasonable to me that the Palestinian refugees must have the right to return and there should be a one state democracy with guaranteed right for all religious communities and those of no religion.
These rights would include
1 Freedom of worship
2 Freedom to gather together to worship
3 Freedom of religious assembly
4 The right to move freely in a peacable way
Freedom to observe religious holidays etc

Obviously these rights would need to be enshrined and guaranteed .
Hugo

And i do recognise that what is easy to write down on paper is a whole lot different in real life but the alternative is another 60 years of repression,bigotry and slaughter.