XML Query Use Case SGML, query 8a, 8b

XML Query Use Cases
W3C Working Draft 15 February 2001

Use Case SGML

1.5.4.8, Query 8a

(1)
The Expected Result says
    Elements whose start-tags are on lines 51, 60
but these are titles, whereas the query asked for sections.
I think you mean "50, 59".

(2)
Each of the sections starting on lines 23 and 59 contains 4 <title>
elements. Thus,
    string(.//title)
returns a list of 4 strings, and
    contains( string(...), "is SGML" )
returns a list of 4 booleans. In order to evaluate the predicate, we must
convert this list to a single boolean. How should this be done?

From the Expected Result, we can deduce that
    boolean([false, false, false, false]) == false
and
    boolean([true,  false, false, false]) == true

A couple of plausible evaluation strategies that fit these deductions are:
    boolean([X,Y, ..., Z]) == X
and
    boolean([X,Y, ..., Z]) == X or Y or ... or Z (logical disjunction)

Which did you have in mind?

Or did you mean "./title" instead of ".//title"? (In which case, this
question fades to the background, although it doesn't go away.)

--------------------
1.5.4.9, Query 8b

Ditto both points for 8a, mutatis mutandis.

-Michael Dyck