Re: [Boost-users] [Property Tree] special character in XML tag

Subject: Re: [Boost-users] [Property Tree] special character in XML tag
From: Michael Powell (mwpowellhtx_at_[hidden])
Date: 2013-02-19 09:20:39

Oh, and here's an Xml serialization tip: you probably already know this if
you've dealt with serialization issues before. Not sure how it is with
INFO, but with Xml, be prepared for asymmetric reads. Writes are pretty
much a straight shot, but reads can be asymmetric: meaning you are not
guaranteed to find attributes, elements, etc in any particular order, as a
general rule, at least not without some help, sorting capability, etc.

Good hunting!

On Tue, Feb 19, 2013 at 7:57 AM, Gábor Márton <martongabesz_at_[hidden]>wrote:

> Hi Michael,
>
> We are reading system wise configuration settings with the use of a
> special API, and then we are populating these values to the ptree.
> There are nodes in the system which has the signature described with
> this regex 'CudbAppServiceId=\d+'. Ptree itself handles this
> perfectly, so we gained a higher level abstraction via the proerty
> tree. The only problem is there, when we want to export the
> configuration to XML.
> Of course one solution would be to go through the ptree instance, and
> search for the regex mentioned before and replace the equality sign in
> every node. I consider this as a too high level solution, I think this
> should rather be handled in the write_xml function.
>
> BR,
> Gabor
>
> On Tue, Feb 19, 2013 at 12:34 PM, Michael Powell <mwpowellhtx_at_[hidden]>
> wrote:
> >
> > On Tue, Feb 19, 2013 at 3:30 AM, Gábor Márton <martongabesz_at_[hidden]>
> > wrote:
> >>
> >> Hi,
> >>
> >> 'CudbAppServiceId=1' is not an attribute, this should be the tag
> >> itself. In fact, the XML would be correct if the tag would not contain
> >> the special equality sign.
> >
> >
> > Kind of my point: I might challenge whether CubdAppServiceId1 wasn't
> > intended to be the tag. The '=' just confuses things, except possibly as
> an
> > artifact of the INFO specification, which I am ignorant of.
> >
> >>
> >> 'CudbAppServiceId=1' is a node in the property tree, which don't have
> >> value, but has 3 children.
> >> So a well formed XML would look like this, I suppose:
> >> <?xml version="1.0" encoding="utf-8"?>
> >> <CudbAppServiceId&#61;1>
> >> <userLabel/>
> >> <sqlAppSrvPlSchema>identities-pl.sql</sqlAppSrvPlSchema>
> >> <CudbAppServiceId>CudbAppServiceId&#61;1</CudbAppServiceId>
> >> </CudbAppServiceId&#61;1>
> >>
> >> The bug is reported here:
> >> https://svn.boost.org/trac/boost/ticket/8095
> >>
> >> BR,
> >> Gabor
> >>
> >> On Mon, Feb 18, 2013 at 4:38 PM, Michael Powell <mwpowellhtx_at_[hidden]>
> >> wrote:
> >> > Will assume that he's filed a bug. Not sure what the intended goal is
> >> > since
> >> > I'm not familiar with INFO per se. Are we saying that
> CdbAppServiceId=1
> >> > is
> >> > an attribute?
> >> >
> >> > Or is intended as a tab with "1" value? What sort of general bug is
> >> > this?
> >> > Does it impact pure Xml usage with Xml paths, parents, children,
> >> > elements,
> >> > attributes, values, etc?
> >> >
> >> > Thank you...
> >> >
> >> >
> >> > On Mon, Feb 18, 2013 at 7:37 AM, Sebastian Redl
> >> > <sebastian.redl_at_[hidden]> wrote:
> >> >>
> >> >> On 02/18/2013 02:10 PM, Gábor Márton wrote:
> >> >>>
> >> >>> Hi,
> >> >>>
> >> >>> I have the following property tree, dumped in INFO format:
> >> >>>
> >> >>> CudbAppServiceId=1
> >> >>> {
> >> >>>      userLabel ""
> >> >>>      sqlAppSrvPlSchema identities-pl.sql
> >> >>>      CudbAppServiceId CudbAppServiceId=1
> >> >>> }
> >> >>>
> >> >>> When I dump it in XML format, I got the following:
> >> >>>
> >> >>> <?xml version="1.0" encoding="utf-8"?>
> >> >>> <CudbAppServiceId=1>
> >> >>> <userLabel/>
> >> >>> <sqlAppSrvPlSchema>identities-pl.sql</sqlAppSrvPlSchema>
> >> >>> <CudbAppServiceId>CudbAppServiceId=1</CudbAppServiceId>
> >> >>> </CudbAppServiceId=1>
> >> >>>
> >> >>> This is not a valid XML, because we have a tag "CudbAppServiceId=1".
> >> >>> Of course, any other xml parser like xmllint will fail to parse it,
> >> >>> because of the equality sign in the tag.
> >> >>>
> >> >>> Is there any solution to this problem? Like somehow emitting &#61;
> >> >>> instead of the raw '=' inside the tag and in the text?
> >> >>>
> >> >> Please file a bug. It might still be a few weeks before I get to work
> >> >> on
> >> >> PropertyTree properly again, and this mail will get lost otherwise.
> >> >>
> >> >> Sebastian
> >> >>
> >> >> _______________________________________________
> >> >> Boost-users mailing list
> >> >> Boost-users_at_[hidden]
> >> >> http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >> >
> >> >
> >> >
> >> > _______________________________________________
> >> > Boost-users mailing list
> >> > Boost-users_at_[hidden]
> >> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >> _______________________________________________
> >> Boost-users mailing list
> >> Boost-users_at_[hidden]
> >> http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >
> >
> >
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>