Re: [netmod] Text in import to indicate whether a module is needed as import-only or as implemented
Benoit Claise <bclaise@cisco.com> Tue, 03 March 2020 08:45 UTC
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To: Andy Bierman <andy@yumaworks.com>, Ladislav Lhotka <lhotka@nic.cz>
Cc: NETMOD WG <netmod@ietf.org>
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From: Benoit Claise <bclaise@cisco.com>
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Date: Tue, 03 Mar 2020 09:44:57 +0100
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Subject: Re: [netmod] Text in import to indicate whether a module is needed as import-only or as implemented
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Hi, > > > On Mon, Mar 2, 2020 at 10:23 AM Ladislav Lhotka <lhotka@nic.cz > <mailto:lhotka@nic.cz>> wrote: > > On Mon, 2020-03-02 at 09:52 -0800, Andy Bierman wrote: > > > > > > On Mon, Mar 2, 2020 at 8:57 AM Benoit Claise <bclaise@cisco.com > <mailto:bclaise@cisco.com>> wrote: > > > Sorry to resurrect this old email thread. > > > To me, it's an important piece of information to know that > ietf-netconf-acm > > > is optional to implement. > > > > > > It seems that we have 3 potential places where to insert this > information > > > 1. The associated document. We could and should insert it into > the RFC text. > > > Drawback: Somehow the YANG module is looked at > independently of the > > > associated document > > > 2. import-stmt: people on the list apparently don't like this > > > 3. module description? What harm would it do if the > description could > > > contain this info? > > > > > > > > > > IMO it makes more sense to summarize the imported modules that > need to be > > implemented > > and not mention the ones that are not required. The module > description-stmt > > is better > > than each import. (YANG 1.1 allows the same module to be > imported multiple > > times). > > Modules that have to be implemented can be imported only once. > Adding this > information to the import statement for such modules is IMO more > effective than > having it in the module description. I don't get how it could > become a problem. > > > I do not think this info helps very much. It is duplicate info. > It should be in the description-stmts for the objects defined in the > module. Well, I had in mind the module description The "description-stmts for the objects defined in the module" is yet another place. > It is also self-evident (and defined in YANG) that if you augment some > external node > you have to implement the augmented module. > > This is the classic definition of a CLR. > > Lada > > > Trying to decompose the problem space .... I believe it's common sense to include in the RFC text that ietf-netconf-acm is optional to implement (to take the example in question in https://tools.ietf.org/html/draft-ietf-netconf-notification-capabilities-11) Do we agree that this information should also be contained somewhere, somehow in the YANG module? I would say: yes If yes, what are the options? I agree with Juergen (in a reply in this email thread): ideally a tooling answer would be better. This will take some time. So what do we do now? 3 options: a. import description (description-stmt in import-stmt) module ietf-system-capabilities { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-system-capabilities"; prefix sysc; import ietf-netconf-acm { prefix nacm; } description "_ietf-netconf-acm is optional to implement_."; } b. module description (description-stmt in meta-stmts in module-stmt/submodule-stmt) module ietf-system-capabilities { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-system-capabilities"; prefix sysc; import ietf-netconf-acm { prefix nacm; } import ietf-yang-library { prefix yanglib; description "Revision 2019-01-04 or a revision derived from it is REQUIRED."; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: <https://datatracker.ietf.org/wg/netconf/> WG List: <mailto:netconf@ietf.org> Editor: Balazs Lengyel <mailto:balazs.lengyel@ericsson.com>"; description "This module specifies a module intended to contain system capabilities. System capabilities may include capabilities of a NETCONF or RESTCONF server or a notification publisher. ... _ietf-netconf-acm is optional to implement."_ c. description-stmts for the objects defined in the module leaf node-selector { type nacm:node-instance-identifier; description "Selects the data nodes for which capabilities are specified. The special value '/' denotes all data nodes in the datastore._ietf-netconf-acm is optional to implement._"; } c. looks weird to me, and might need repetitions in different YANG objects. In the end, as an implementer, I only care to understand whether I need to implement "ietf-netconf-acm" as a prequesite to implement ietf-system-capabilities. Between a. and b., I have no strong preferences. However, a. seems to be the logical place to me. Regards, Benoit > > > > > > > Regards, Benoit > > > > > > > Andy > > > > > > > > > > On Wed, Jan 8, 2020 at 5:44 AM Ladislav Lhotka > <lhotka@nic.cz <mailto:lhotka@nic.cz>> wrote: > > > > > On Wed, 2020-01-08 at 04:49 -0800, Andy Bierman wrote: > > > > > > > > > > > > On Wed, Jan 8, 2020 at 1:11 AM Ladislav Lhotka > <lhotka@nic.cz <mailto:lhotka@nic.cz>> wrote: > > > > > > > On Tue, 2020-01-07 at 14:29 +0000, Balázs Lengyel wrote: > > > > > > > > If that is the consensus, I can remove the > description statements, > > > > > no big > > > > > > > > deal. (I actually like the statements, but they are > not important > > > > > for this > > > > > > > > draft) > > > > > > > > > > > > > > Of course, it is not that important, but I don't see > how this > > > > > information > > > > > > > could > > > > > > > be harmful, if it is included with the import. In my > view, it is not > > > > > meant > > > > > > > as a > > > > > > > conformance requirement but just an info from the > module author > > > > > about the > > > > > > > meaning of the import statement. > > > > > > > > > > > > > > > > > > > It adds a lot of extra work but more importantly the > import-stmt is > > > > > the wrong > > > > > > place > > > > > > > > > > What work do you mean? I thought that it would be just > info for > > > > > potential > > > > > developers (or their managers) that implementing the > module requires > > > > > implementing other modules and functionality - or not. > > > > > > > > > > > > > > > > > > > > > > It is duplication because the individual data-def statements > should have > > > > any notes > > > > about implementation requirements. The duplication may even > be wrong. > > > > E.g., in the module it says NACM is not required, but what > if some objects > > > > have NACM requirements listed in the Security Considerations > section? > > > > That is the RFC section to discuss NACM requirements. > > > > > > > > > > > > > For example, if a module imports ietf-netconf-nacm only > for using "node- > > > > > instance-identifier" type, it is relatively uninteresting. > Otherwise, > > > > > implementation of the module may just be out of question. > > > > > > > > > > > > > > > > to document such a complex and unrelated issue as server > conformance > > > > > > requirements. > > > > > > > > > > > > > > > > > > > The root of this problem (and design flaw of YANG, > IMO) is that > > > > > import is > > > > > > > "overloaded" with two different purposes, one of which > effectively > > > > > requires > > > > > > > that > > > > > > > the imported module be also implemented, while the > other doesn't. > > > > > > > > > > > > > > > > > > > The import-stmt is only used to map a local prefix to an > external > > > > > module. > > > > > > > > > > But one thing is using a prefix for accessing top-level > types and > > > > > groupings > > > > > (i.e. stuff in YANG modules), and another thing is > accessing schema > > > > > nodes, which > > > > > have to be present in the schema tree. In complicated data > models, it is > > > > > not > > > > > exactly easy to figure out all these dependencies. > > > > > > > > > > > > > > > > > > I do not agree these are different things. > > > > In both cases the prefix is used to determine the imported > module that > > > > contains the identifier. > > > > > > > > > > > > > So maybe what is really overloaded are the namespace > prefixes: they are > > > > > used for > > > > > addressing YANG modules, schema nodes and instances (in > XPath). > > > > > > > > > > Lada > > > > > > > > > > > > > > > > > Andy > > > > > > > > > > This proposal to add conformance info the the > import-stmt would > > > > > overload it > > > > > > with > > > > > > another purpose. > > > > > > > > > > > > Not even a typedef is easy to classify (e.g., leafref > requires > > > > > implementation > > > > > > of a data node). > > > > > > I certainly agree that YANG conformance is poorly > specified, poorly > > > > > > understood, and > > > > > > in real need of improvement. Likewise, the import-stmt > is also in need > > > > > of some > > > > > > improvement > > > > > > since import-by-exact-revision is (and has always been) > poorly > > > > > designed. > > > > > > > > > > > > > > > > > > > Lada > > > > > > > > > > > > > > > Balazs > > > > > > > > > > > > Andy > > > > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > > > From: Martin Bjorklund <mbj@tail-f.com > <mailto:mbj@tail-f.com>> > > > > > > > > Sent: Tuesday, January 7, 2020 2:38 PM > > > > > > > > To: Balázs Lengyel <balazs.lengyel@ericsson.com > <mailto:balazs.lengyel@ericsson.com>> > > > > > > > > Cc: andy@yumaworks.com <mailto:andy@yumaworks.com>; > lhotka@nic.cz <mailto:lhotka@nic.cz>; netmod@ietf.org > <mailto:netmod@ietf.org> > > > > > > > > Subject: Re: [netmod] Text in import to indicate > whether a module > > > > > is > > > > > > > needed as > > > > > > > > import-only or as implemented > > > > > > > > > > > > > > > > Hi > > > > > > > > > > > > > > > > I agree w/ Andy and others that we should not add > this to the > > > > > import's > > > > > > > > description. I don't think this kind of conformance > text belongs > > > > > to the > > > > > > > > import's description. If you think it is important > to state this, > > > > > the > > > > > > > best > > > > > > > > place is probably as plain text in the document itself. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > /martin > > > > > > > > > > > > > > > > > > > > > > > > Balázs Lengyel > <balazs.lengyel=40ericsson.com@dmarc.ietf.org > <mailto:40ericsson.com@dmarc.ietf.org>> > > > > > wrote: > > > > > > > > > As a draft author who was asked to add text about > the imports > > > > > IMHO > > > > > > > > > > > > > > > > > > * it would be easy for me to remove the > description from the > > > > > import. > > > > > > > > > Actually I really just want to know what is > acceptable to the > > > > > group, so > > > > > > > I > > > > > > > > > can proceed > > > > > > > > > * I also think that adding this text is in most > cases easy and > > > > > it does > > > > > > > not > > > > > > > > > need updates later. > > > > > > > > > * The rules in some cases might not be trivial. > > > > > > > > > > > > > > > > > > * Imported YAMs need to be implemented if > > > > > > > > > > > > > > > > > > * Imported parts are included in Xpath (augment, > when, must, > > > > > require- > > > > > > > > > instance) > > > > > > > > > > > > > > > > > > * Imported YAMs do not need to be implemented if > only the > > > > > following > > > > > > > are > > > > > > > > > used > > > > > > > > > > > > > > > > > > * Types > > > > > > > > > * Features > > > > > > > > > * extensions > > > > > > > > > > > > > > > > > > * Ambiguous if > > > > > > > > > > > > > > > > > > * groupings are used > > > > > > > > > * if the dependency is not formally defined by > YANG, but > > > > > functionally > > > > > > > > > needed. (E.g. notification-capabilities does not > formally need > > > > > YANG- > > > > > > > > > Push > > > > > > > to > > > > > > > > > be implemented, however there is no sense in defining > > > > > capabilities if > > > > > > > YANG- > > > > > > > > > Push is itself not implemented.) > > > > > > > > > * deviation ? > > > > > > > > > * other cases ? > > > > > > > > > > > > > > > > > > Regards Balazs > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > From: netmod <netmod-bounces@ietf.org > <mailto:netmod-bounces@ietf.org>> On Behalf Of Andy Bierman > > > > > > > > > Sent: 2019. december 19., csütörtök 17:23 > > > > > > > > > To: Ladislav Lhotka <lhotka@nic.cz > <mailto:lhotka@nic.cz>> > > > > > > > > > Cc: NetMod WG <netmod@ietf.org > <mailto:netmod@ietf.org>> > > > > > > > > > Subject: Re: [netmod] Text in import to indicate > whether a > > > > > module is > > > > > > > > > needed as import-only or as implemented > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > On Thu, Dec 19, 2019 at 8:00 AM Ladislav Lhotka > <lhotka@nic.cz <mailto:lhotka@nic.cz> > > > > > <mailto: > > > > > > > > > lhotka@nic.cz <mailto:lhotka@nic.cz>> > wrote: > > > > > > > > > > > > > > > > > > On Thu, 2019-12-19 at 07:52 +0000, Schönwälder, > Jürgen wrote: > > > > > > > > > > On Thu, Dec 19, 2019 at 08:23:27AM +0100, > Ladislav Lhotka > > > > > wrote: > > > > > > > > > > > I don't see how YANG syntax defines this. If a > module > > > > > imports > > > > > > > > > > > ietf-netconf- acm, it could be because > > > > > > > > > > > > > > > > > > > > > > - it just uses a typedef, such as "node-instance- > > > > > identifier", and > > > > > > > then > > > > > > > > > > > ietf-netconf-acm needn't be implemented (but > can be), > > > > > > > > > > > > > > > > > > > > > > or > > > > > > > > > > > > > > > > > > > > > > - it augments ietf-netconf-acm, which makes > sense only if > > > > > the latter > > > > > > > > > > > module is implemented. > > > > > > > > > > > > > > > > > > > > > > It it the YANG library that specifies whether > a module is > > > > > > > > > > > implemented or not, but the "import" statement > itself > > > > > doesn't tell > > > > > > > you > > > > > > > > > > > anything. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Can we not assume that an implementor will > figure out the > > > > > difference? > > > > > > > > > > > > > > > > > > An implementor should be able to figure it out, > but other > > > > > potential > > > > > > > > > module users may not. For example, if somebody is > evaluating > > > > > whether > > > > > > > > > to use a module for their device or not, it is > important to know > > > > > that > > > > > > > > > NACM has to be implemented (or not). > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > You seem to be talking about a new conformance > documentation > > > > > procedure > > > > > > > > > > > > > > > > > > that attempts to solve the problem "to use modules > A, B, and C > > > > > > > > > together > > > > > > > > > > > > > > > > > > to achieve some functionality X, all these > conditions need to be > > > > > met".. > > > > > > > > > > > > > > > > > > (Sounds more like a problem for YANG Packages to > solve) > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > IMO this is a much harder problem than something > that can be > > > > > solved > > > > > > > > > > > > > > > > > > with extra description-stmt text. The writer is > likely to get it > > > > > wrong > > > > > > > > > or not > > > > > > > > > > > > > > > > > > keep it up to date, so a tool to analyze the file > seems like a > > > > > better > > > > > > > > > solution. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Lada > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Andy > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Or someone writes a pyang plugin to determine > from the schema > > > > > tree > > > > > > > > > > the kind of imports there are (for a given set > of features). > > > > > > > > > > > > > > > > > > > > /js > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > Ladislav Lhotka > > > > > > > > > Head, CZ.NIC Labs > > > > > > > > > PGP Key ID: 0xB8F92B08A9F76C67 > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > > > netmod mailing list > > > > > > > > > netmod@ietf.org <mailto:netmod@ietf.org> > <mailto:netmod@ietf.org <mailto:netmod@ietf.org>> > > > > > > > > > https://www.ietf.org/mailman/listinfo/netmod > > > > > > > > > > > > > > -- > > > > > Ladislav Lhotka > > > > > Head, CZ.NIC Labs > > > > > PGP Key ID: 0xB8F92B08A9F76C67 > > > > > > > > > > _______________________________________________ > > > > > netmod mailing list > > > > > netmod@ietf.org <mailto:netmod@ietf.org> > > > > > https://www.ietf.org/mailman/listinfo/netmod > > > > > > > > > > > > > > > > > _______________________________________________ > > > > netmod mailing list > > > > netmod@ietf.org <mailto:netmod@ietf.org> > > > > https://www.ietf.org/mailman/listinfo/netmod > > > > -- > Ladislav Lhotka > Head, CZ.NIC Labs > PGP Key ID: 0xB8F92B08A9F76C67 >
- Re: [netmod] Text in import to indicate whether a… Balázs Lengyel
- Re: [netmod] Text in import to indicate whether a… Martin Bjorklund
- [netmod] Text in import to indicate whether a mod… Balázs Lengyel
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Ladislav Lhotka
- Re: [netmod] Text in import to indicate whether a… Schönwälder
- Re: [netmod] Text in import to indicate whether a… Ladislav Lhotka
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Balázs Lengyel
- Re: [netmod] Text in import to indicate whether a… Ladislav Lhotka
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Ladislav Lhotka
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Benoit Claise
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Ladislav Lhotka
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Schönwälder, Jürgen
- Re: [netmod] Text in import to indicate whether a… Benoit Claise
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Balázs Lengyel
- Re: [netmod] Text in import to indicate whether a… Andy Bierman
- Re: [netmod] Text in import to indicate whether a… Balázs Lengyel
- Re: [netmod] Text in import to indicate whether a… Andy Bierman