parsing/transforming xml could lead to leaks

[kares]

Nokogiri installs a XML error handler, this handler keeps a list of warning/errors.
Each warning or error is internally represented as a org.xml.sax.SAXParseException.
These are than available as (transformed) XML errors using doc.errors ...

Growing the error list is tied to the document but is not bounded -> many (failing) transformations will cause the list to grow. This could lead to potential memory leaks.

We need a few reproducers for filling the error list - potentially one during parsing and also verify whether the list could potentially grow during transformation or xpath extraction.

A reasonable resolution for the issue would be to introduce a configuration for parse options to allow an XML document to be created in strict mode - in this mode exceptions bubble up (instead of being stored). The plugin should than potentially log the errors and tag the event with a parse failure ...