MDX Query, how to select first and last year of an event's period - mdx

Question

I have a publications datamart from teachers of my university, I would like to select the list of teachers with how much books they wrote and in period while them publicated the books.
Example
Teacher - Last Year of pubblication - Number of Books
Teacher A - 2014 - 200 books
I tried to do something like:
WITH MEMBER [Measures].[LastYear] AS
'(ClosingPeriod([Anno].[Anno])
,[Autore].[Nome].CurrentMember)'
SELECT
{[Measures].[Unita (Libri)],[Measures].[LastYear]} ON COLUMNS,
NON EMPTY
[Autore].[Nome].Members ON ROWS
FROM [Pubblicazioni]
but the field last year is alway void, if i try to change the second part of ClosingPeriod with [Measures].[Unita (libri)] it is empty too... How should i implement that query? I'm a bit confused about
EDIT
select [Measures].[Libri] ON COLUMNS,
crossjoin([Autore.default].[Nome].[Fazzinga, Bettina], tail(NonEmptyCrossJoin([Autore.default].[Nome].[Fazzinga, Bettina], [Anno.default].[Anno].Members), 1).Item(0).Item(1)) ON ROWS
from [Pubblicazioni]
This one is working great for the teacher [Fazzinga, Bettina], but the query stops to work while i doing
select [Measures].[Libri] ON COLUMNS,
crossjoin([Autore.default].[Nome].Members, tail(NonEmptyCrossJoin([Autore.default].[Nome].CurrentMember, [Anno.default].[Anno].Members), 1).Item(0).Item(1)) ON ROWS
from [Pubblicazioni]

Answer 1

Measures needs some form of value or string to return, I think that is why your measure is returning void as ClosingPeriod is returning a member rather than value.
The following is not tested:
WITH MEMBER [Measures].[LastYear] AS
'(Tail(
nonempty(
[Anno].[Anno]
,([Autore].[Nome].CurrentMember, [Measures].[Unita (Libri)])
)
).item(0).item(0).MEMBERVALUE)'
SELECT
{[Measures].[Unita (Libri)],[Measures].[LastYear]} ON COLUMNS,
NON EMPTY
[Autore].[Nome].Members ON ROWS
FROM [Pubblicazioni]
Try this one instead:
SELECT
[Measures].[Libri] ON COLUMNS
,Generate
(
[Autore.default].[Nome].MEMBERS
,Tail
(
//NonEmptyCrossJoin <<hopefully nonempty is enough
NonEmpty
(
[Autore.default].[Nome].CurrentMember * [Anno.default].[Anno].MEMBERS
)
,1
) //.Item(0).Item(1) //<<don't believe this is required
) ON ROWS
FROM [Pubblicazioni];

Answer 2

I finally found a way to get it... Natively, every calculated member in the clause "WITH MEMBER" are treated as information of cube. In my case, if i do max("xpression of years when author worked") it will give the number of books he wrote in the relative max year. To avoid this, there is a construct called SetToStr() that will print the year as a String (something like [Hyerarchie].[Level].[Value]). The string can simple cutted with left() and right() condition. Here is the result:
WITH MEMBER [Measures].[Anno prima pubblicazione] AS 'left(right(settostr(head(extract(nonemptycrossjoin([Anno].[Anno].Members, nonemptycrossjoin([Libro].[Titolo].Members,[Autore].[Nome].CurrentMember)),[Anno]),1)),6),4)'
MEMBER [Measures].[Anno ultima pubblicazione] AS 'left(right(settostr(tail(extract(nonemptycrossjoin([Anno].[Anno].Members, nonemptycrossjoin([Libro].[Titolo].Members,[Autore].[Nome].CurrentMember)),[Anno]),1)),6),4)'
SELECT {[Measures].[Anno prima pubblicazione],[Measures].[Anno ultima pubblicazione]} ON COLUMNS,
[Autore].[Nome].Members ON ROWS
FROM [Pubblicazioni]
This query work in this way:
1) extract books for the current author with nonemptycrossjoin([Libro].[Titolo].Members,[Autore].[Nome].CurrentMember) so i get the tuple ;
2) I let the year join the previous tuple with nonemptycrossjoin([Anno].[Anno].Members,);
3) In my case the DM is ordered yet for year, in other case we should use even the function order;
4) we don'n need all that things, so we trash what we doesn't need using extract(,[Anno]), this mean i will maintain only the values of hierarchy [Anno];
5) we just need the first entry of the ordered list of years and we use head() function;
6) we can't use the value yet or MDX will count entries in the fact table for the value of [Anno] we selected, so we transform it as string with setToStr();
7) the value is still dirty, cause the string has hiearchy too, so we clean it using left() and right() function (a year is always composed by 4 chars).
It is a little big function, but this is the only one worked for me :)