Usually metadata in the form of RDF triples are stored within databases, called triplestores. However, in order to expose them through a web page in the RDFa format, you need a way to dynamically query the RDF database and the results should be returned as RDFa annotations inside HTML code. I could not locate tools / frameworks that ease such a task. Should this be done programmatically through PHP, ASP, etc.? Or is there an easier way?
You can take a look at DBpedia Spotlight https://github.com/dbpedia-spotlight/dbpedia-spotlight/wiki
Using their Web service you can get your page back annotated by RDFa.
You can also try RDFaCE for annotating some parts of your page using RDFa or Microdata http://rdface.aksw.org/
There's a Ruby RDFa reader/writer at https://github.com/ruby-rdf/rdf-rdfa that may be useful to you, especially its RDFa writer (https://github.com/ruby-rdf/rdf-rdfa#template-based-writer) that allows using a template for writing RDFa formatted graphs.
Depends on the complexity. If it does not require complex operatins, I would not search someone else's tool and write it in PHP possibly using XSLT libraries. If the web page is not heavily loaded, external XSLT processor can also be used. If the page does not change too often, I build my own cache, for one project I programmed caching machine in PHP or it is possible not to access web server directly but always through squid.
http://wifo5-03.informatik.uni-mannheim.de/bizer/rdfapi/
May not be exactly what you're after, I use it in a very lightweight way to read RDF from external APIs, then render the info in my webpages
RDF in itself does not contain any predefined vocabularies for authoring metadata. We do, however, expect that standard vocabularies will emerge, after all this is a core requirement for large-scale interoperability. Some of the vocabularies in the foreseeable future are a PICS-like rating architecture, a digital library vocabulary (currently referred to as "Dublin Core"), and a vocabulary for expressing digital signatures. Anyone can design a new vocabulary, the only requirement for using it is that a designating URI is included in the metadata instances using this vocabulary. This use of URIs to name vocabularies is an important design feature of RDF: many previous metadata standardization efforts in other areas have foundered on the issue of establishing a central attribute registry. RDF permits a central registry but does not require one.
Html is composed by plain text with tags.
is possible use TextToOnto (TexttoOnto) is to support developers in the ontology construction process by applying text mining techniques. For this purpose it builds on KAON
(http://kaon.semanticweb.org)
with Owl is possible make Rdf files.
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