No longer use XML::Parser and XML::Parser::Lite, switch to XML::LibXML

[bschmalhofer]

For some reason both XML::LibXML and XML::Parser are used in OTOBO. I propose to standardise on XML::LibXML.

[svenoe]

In principle there is no reason against it, priority is very low however.

[bschmalhofer]

XML::Parser is also used in Kernel::System::XML which adds another layer of brokenness. Examples of the brokenness are now included in scripts/test/XML.t .

[bschmalhofer]

Enhanced the documentation for Kernel::System::XML and added some tests.

[bschmalhofer]

Kernel::System::XML also uses XML::Parser::Lite when XML::Parser has problems. Let't test without the fallback first, before migrating Kernel::System::XML to XML::LibXML.

[bschmalhofer]

Kernel::System::XML could be migrated to XML::LibXML by using XML::LibXML::SAX::Parser. Let's see whether it can be made bug compatible.

[bschmalhofer]

In Kernel/GenericInterface/Mapping/XSLT.pm there is an usage of XML::Simple. XML::Simple falls back to XML::Parser for parsing XML. A first idea is to switch to Kernel::System::XML::Simple, but that module does not have a XMLOut() method. XMLOut() can't be easily added, as the underlying module XML::LibXML::Simple does not have XMLOut(). So let's stick with XML::Simple. But let's tell XML::Simple to use XML::LibXML::SAX::Parser for the parsing part.

[bschmalhofer]

Replaced all usages of XML::Parser that I found. The test suite looks fine. Closing this issue.