XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition (490 page)

Authors: Michael Kay

Patterns that specify both the node name and its schema type, for example
attribute(@code, mf:part-number)
, are more specific than those that specify only the name or the type, so they get a priority of +0.25.
Patterns that provide a more specific context, for example
book[@isbn]
or
chapter/title
or
para[1]
, have a higher priority, so they will be chosen in preference to templates whose patterns are respectively
book
,
title
or
para
. Note, however, that this category can also include patterns that turn out not to be very selective at all; for example,
//node()
.

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