generate errors when legit SCHEMA elements are in the wrong context

[JohnAD]

Not much context checking occurs right now. So,

name joe
    value
        type boolean
        name larry

does not generate an error message even though a name element has no meaning in the value context. It should probably be:

name joe
    value
        type boolean
    name larry

which simply makes larry a descendant of joe.

Really, all the elements should be checked for context, but handling name is highest priority IMO.