Re: [libvirt] [PATCH v2 0/6] rewrite virt-host-validate to be data driven, using Go & YAML

On Mon, Sep 30, 2019 at 15:48:29 +0100, Daniel Berrange wrote: > On Mon, Sep 30, 2019 at 10:47:39AM +0200, Martin Kletzander wrote: > > On Fri, Sep 27, 2019 at 01:52:19PM +0100, Daniel P. Berrangé wrote: > > > This is a followup to a previous PoC patch I submitted a > > > month ago: [...] > > The choice of YAML is a valid point to use as that is definitely adding > a new language where one already exists (XML) that is expressive enough > to cope with the problem. As you saw the original v1 did indeed use XML > for this reason. > > The decision to try YAML was an experiment to see if the simplicity and > readability of YAML would outweigh the cost of having another data language. > Personally I think it is a net win to use YAML instead of XML, but it > would not be the end of the world to go back to the v1 approach using > XML if people really want a less readable language just to not have to > add another data language. In my opinion this is a misunderstanding. Whether it's YAML or XML used for syntax is not that important. What is important is that the new 'language' is the custom declarative language which uses YAML or XML to express the constructions. It's custom and barely documented. To get to the documentation you need to read the source of the interpreter where you need to transform it mentally to what it translates to.