How to search values in attributes and retrieve them?

[Go S]

Hello like-minded people!

I have two questions regarding processing RDF.

I have RDF/XML from GeoNames.

The overall structure of an entity looks like this:

<rdf:RDF>

<gn:Feature rdf:about="http://sws.geonames.org/3166548/"></gn:Feature>

<foaf:Document rdf:about="http://sws.geonames.org/3166548/about.rdf"></foaf:Document>

</rdf:RDF>

From there, I would like to extract all the URLs. For example:

<gn:parentFeature rdf:resource="http://sws.geonames.org/6541466/"/>

<dcterms:created rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2006-01-15</dcterms:created>

To this end,

1) How can I search values (i.e. regular expression for "http://") in attributes?

2) After that, how can I fetch the string value of the attributes (i.e. http://sws.geonames.org/6541466/ and http://www.w3.org/2001/XMLSchema#date)?

Can anyone help on those? Many thanks in advance!

Go