Re: [netmod] Query about must statement syntax

"Ivory, William" <william.ivory@intl.att.com> Tue, 07 January 2020 11:44 UTC

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From: "Ivory, William" <william.ivory@intl.att.com>
To: "mbj@tail-f.com" <mbj@tail-f.com>
CC: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] Query about must statement syntax
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Date: Tue, 7 Jan 2020 11:44:23 +0000
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Subject: Re: [netmod] Query about must statement syntax
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Thanks for confirming.

William

On Tue, 2020-01-07 at 12:42 +0100, Martin Bjorklund wrote:

Hi,


"Ivory, William" <william.ivory@intl.att.com<mailto:william.ivory@intl.att.com>> wrote:

Hi,


I've got a must statement that causes a compilation error on a Cisco NCS device (admittedly ancient (NCS version 3.4.4), but can't update it), as follows:


must "(../../packets * current()) <= (../../interval * 1000)";


Error is 'error: XPath syntax error: 40: unknown operator current'


However, our internal XPATH compiler thinks this is valid, and if I change the order in the must statement to the following, the NCS is happy:


must "(current() * ../../packets) <= (../../interval * 1000)";


Can anyone confirm if there is a genuine error in the original must

statement, or is it valid XPATH?


The XPath expression is legal.



/martin