I'm reading through the docs in
http://community.marklogic.com/pubs/5.0/books/performance.pdf and it says :

XPath predicates that cross fragment boundaries are unsearchable (cannot
use indexes).

For example, if a document is fragmented at the b element, then you should
make sure predicates do not cross the b boundary. Therefore, the following
expression:

/a/b[c="1"]/../d

will run faster than the following expression:

/a[b/c="1"]/d



How do you determine / modify a document's fragmentation boundary ?

Regards,
Danny
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