Hi Lada,
Thanks for the explanation, that makes sense.
On 20/10/2017 16:27, Ladislav Lhotka wrote:
Hi Rob,
Robert Wilton <[email protected]> writes:
Hi,
XPATH 1.0 defines the following three node-type tests:
1) comment()
2) processing-instruction(<opt arg>)
3) text()
For completeness, node() is the fourth one.
My assumption is that a YANG tree doesn't contain any nodes of type
'comment' or 'processing-instruction' and hence these filters would
never match any nodes.
Yes. FWIW, Yangson library raises NotSupported exception upon
encountering these.
However, it wasn't clear to me from reading 7950 or rfc6087bis-14
whether text() matches anything. In particular, does a YANG leaf node
(except of type empty) always parent a text node that holds its value?
I believe this is how it should be interpreted. According to XPath 1.0
spec, comparisons like
xyz = 'foo'
use string-value of xyz node, which is defined as the concatenation of
the string-values of all text node descendants of xyz.
Yes. I don't think that I've ever come across for XPath usage in YANG
where the "concatenation of the string-values of all text node
descendants " is actually useful (particularly as the children nodes are
likely to not be consistently ordered).
Thanks,
Rob
Lada
Thanks,
Rob
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