Parse more information from the RNG grammar.

[vandenoever]

The parser now knows which elements or attributes are allowed on elements.
It also know which elements may contain text.
This information is not yet output.

[kogmbh-ci]

Build succeeded.
Refer to this link for build results: http://ci.kogmbh.com/jenkins/job/WebODF-PullReq/2407/

[kogmbh-ci]

Build succeeded.
Refer to this link for build results: http://ci.kogmbh.com/jenkins/job/WebODF-PullReq/2408/

[peitschie]

There's a firstElementChild and nextElementSibling properties you might be able to use here instead?

[vandenoever]

These are not available in the DOM implementation that WebODF uses on Node.js.

[peitschie]

Code is good though. I really like your API dox... very clear and informative 😄

[vandenoever]

@peitschie Thanks for the review. I've found an error in the implementation and will update the PR once I fix that. This code is a port from Java code I'm working on. Once the Java code stabilizes, I'll update this code.

[kogmbh-ci]

Build failed.
Refer to this link for build results: http://ci.kogmbh.com/jenkins/job/WebODF-PullReq/2423/