Hi all,
I notice draft-ietf-netmod-rfc6020bis-09 still uses xpath1.0 as a notation for
checking node references or dependencies.
I don’t know why we don’t use xpath3.0 or xpath2.0? xpath3.0 is more powerful
than xpath1.0.
For example, xpath3.0 introduced conditional expression. It’s very useful for
must statement.
If we have a schema tree like this:
List l {
Key a;
Leaf a {…}
Leaf b {…}
Leaf c {…}
Leaf d {…}
}
If a= 5 and b=10 and c >20, then d must be less than 30 and greater than 15.
If use xpath1.0, the MUST statement should be:
Must “a != 5
or b != 10
or c <=20
or (a =5 and b = 10 and c>20 and d >15 and d < 30)”
if use xpath3.0:
must “if (a =5 and b = 10 and c>20)
then d>15 and d<30
else true()”
if we feel xpath3.0 is too complicated, we can specify a small set of xpath
grammar for YANG.
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冯冲
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