Re: Need help on normalization/canonicalization with namespace prefix rewrite

Eric,

Thank you!
I modified some functions in c14n.c to meet my task.

Mikhail

On Mon, Jan 29, 2018 at 10:31 PM, Eric S. Eberhard <[email protected]> wrote:

> My experience is that many surprising companies don't do correct XML.
> Walmart for example does not put white space between attributes:
>
> attr1="value1"attr2="value2"
>
> I have one company that insists on one line (to CR or LF) for the entire
> XML (hard to read and debug).  Another won't take lines longer than 1024.
>
> Once can spend all decade trying to Fedex to change, Walmart to change,
> all year changing libxml2, etc.
>
> I went another way.  I have a pre and post filter on my XML that makes it
> as I want it.
>
> So when I get XML I run it through the pre-filter and change as needed
> (based on a libxml2 setup XML file!) and when I send it I run it through a
> post-filter and change as needed also based on libxml2 setup XML file.
>
> One can be "right" and waste more time than it is worth ... I dare anyone
> to try and "fix" Fedex or Walmart who insists they are correct ... or
> dozens of other companies.  It is easier to just fix it your self, and then
> process it.
>
> This also has the advantage that the processing code is "clean" -- since
> your input and output will be standard (whatever you chose) ... only the
> pre/post filters may need work.  Of course you need only filter the
> goofballs (99% of our stuff goes through as is).
>
> Another advantage is the pre/post filters don't have to use libxml2 at all
> (mine don't) -- read through them "by hand" with whatever language you use
> and you can change tags, namespaces, anything you like in any direction.
> Just make sure the result is valid!
>
> Just an idea but libxml2 cannot do everything for everyone -- especially
> when huge corporations do as they please.  It is a tool kit, not a complete
> car ... if you want to rebuild the engine, get the tools out, use them, and
> build your engine ... don't expect the tools to do everything.  Instead,
> just depend on them having all the tools which so far (as a user from way
> back when it was libxml.a) it has always worked and been reliable and fast.
>
> Eric
>
> On 1/28/2018 4:19 AM, Mikhail Goloborodko wrote:
>
> Hi All,
>
> I will appreciate if somebody could help on how to normalize and
> canonicalize XML.
>
> For example
> <?xml version="1.0" encoding="WINDOWS-1251"?>
> <ed:N1 attr="4583001999" xmlns:ed="urn:ru:ed:v2.0">
> </ed:N>
>
> I need to get
>
> <n1:N1 xmlns:n1="urn:cbr-ru:ed:v2.0" attr="4583001999"></n1:N1>
>
> And for
>
> <?xml version="1.0" encoding="WINDOWS-1251"?>
> <N1 attr="4583001999" xmlns="urn:ru:ed:v2.0">
>   <N2 attr="value"></N2>
> </N1>
>
> I need
>
> <n1:N1 xmlns:n1="urn:ru:ed:v2.0"> attr="4583001999"<n1:N2
> attr="value"></n1:N2></n1:N1>
>
> In other words I need to remove whitespaces and rewrite namespace prefixes
> I use
> string src;
> xmlChar * canon;
> xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr, nullptr,
> XML_PARSE_NOBLANKS);
> int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, & canon);
>
> It removes whitespaces, need help with namespace prefix rewrite.
>
> Thank you in advance.
>
> On Sun, Jan 28, 2018 at 12:41 AM, Mikhail Goloborodko <
> [email protected]> wrote:
>
>> Hi,
>>
>> I need help on how to normalize and canonicalize XML.
>> For example
>> <?xml version="1.0" encoding="WINDOWS-1251"?>
>> <ed:N1 attr="4583001999" xmlns:ed="urn:ru:ed:v2.0">
>> </ed:N>
>>
>> I need to get
>>
>> <n1:N1 xmlns:n1="urn:cbr-ru:ed:v2.0" attr="4583001999"></n1:N1>
>>
>> And for
>>
>> <?xml version="1.0" encoding="WINDOWS-1251"?>
>> <N1 attr="4583001999" xmlns="urn:ru:ed:v2.0">
>>   <N2 attr="value"></N2>
>> </N1>
>>
>> I need
>>
>> <n1:N1 attr="4583001999" xmlns="urn:ru:ed:v2.0"><n1:N2
>> attr="value"></n1:N2></n1:N1>
>>
>> In other words I need to remove whitespaces and rewrite namespace prefixes
>> I use
>> string src;
>> xmlChar * canon;
>> xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr, nullptr,
>> XML_PARSE_NOBLANKS);
>> int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, & canon);
>>
>> It clearly removes whitespace, need help with namespace prefix rewrite.
>>
>> Thank you in advance.
>>
>> Mikhail
>>
>>
>
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> Eric S. Eberhard
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