Describing newspaper articles

I'm not sure whether it contains all that you need but you can take a look at the Bibliographic Ontology [1] or the SWRC Ontology [2]. Otherwise, more generally, I advise you to take a look at [3] which references many tools you can use to find the terms/vocabularies/ontologies you need.

• [1] bibo. http://bibliontology.com/
• [2] http://ontoware.org/swrc/
• [3] http://esw.w3.org/Ontology_Dowsing

1. Probably foaf:page, going from your article to the page on the website.
2. dcterms:references, going from the other web page to the article.
3. I would do this by linking them to the same topics, e.g. via dcterms:subject, foaf:topic/foaf:primaryTopic, sioc:topic. There are various options for the URIs of those topics. UMBEL might interest you, they have quite a lot of interesting writing on linking documents via subjects as well.
4. Maybe you can use dcterms:conformsTo for linking to the statement of principles but you probably have to develop your own vocabulary/dataset for giving URIs to those statements and describing them.

You should probably dig a bit deeper into the vocabularies I linked, they will have lots of useful terms for you.