an introduction to rdfa
by mark birbeck
Putting clearer metadata into web-pages would help the search
engines, as well as improve the user experience.
rdfa originates in work doneon xhtml 2, but can be used
in mark-up today
Putting clearer metadata into web-pages would help the search
engines, as well as improve the user experience.
we need to unlock
the metadata already
in web-pages, as
well as encourage
people to add more
The RDFa approach is to recognise that there is an enormous
amount of useful information embedded in web-pages, and we want to
get it out.
rdfa provides a generic
way to do this by
building on features
already in html
Putting clearer metadata into web-pages would help the search
engines, as well as improve the user experience.
What do we have already?
Meta, link, etc.
Zakim Bridge by Paul Keleher
...
First change is to add @about.
Probably the most important addition, since you can now talk
about other things.
Note that we're still using @rel.
Zakim Bridge by Paul Keleher
...
First change is to add @about.
Probably the most important addition, since you can now talk
about other things.
Note that we're still using @rel.
Boston Harbor by Paul Keleher
A picture of
Boston Harbor
A picture of
Boston Harbor
taken by
Paul.
Next we can add text properties.
Note that we could already add links in the document.
A picture of
Boston Harbor
taken by
Paul
.
Boston Harbor by Paul Keleher
Next we can add text properties.
Note that we could already add links in the document.
Christmas Lights by Paul Keleher
A picture of
Christmas Lights
taken on
December 1st.
A picture of
Christmas Lights
taken on
December 1st
.
We can indicate data types. This came up in the session on
microformats.
Christmas Lights by Paul Keleher
A picture of
Christmas Lights
taken on
December 1st
.
We can indicate data types. This came up in the session on
microformats.
Spiral Staircase by Paul Keleher
Spiral Staircases
taken by
Paul Keleher.
We can use namespaces.
This means that anyone can devise their own format, you don't
need to get permission from anyone.
That is, after all, what the web is all about.
Spiral Staircase by Paul Keleher
Having the geo data on any document means that a rich client
could place it on a map, no matter what it is, or on what
document.
Ivan Herman
knows Mark Birbeck and they are meeting today.
You can connect to resources that aren't clickable.
Ivan Herman
knows Mark Birbeck and they are meeting today.
You can connect to resources that aren't clickable.
A book.
A book.
You can connect to resources that aren't clickable.
Ivan Herman
knows
Mark Birbeck
and they are meeting today.
You can connect to resources that aren't clickable.
Twitter Name:
markbirbeck
So let's see some examples of how this improves the user
experience.
Or should this be merged with Ivan's slide?
summary
about: determines what we're talking about
property and content: set text values
datatype: sets the type of a text value
instanceof: sets the type of something
resource: same as href, but not clickable
rel and rev: had before, but now work with src
rdfa is basically microformats big brotherdaniel e. renfer
rdfa is microformats done rightbob ducharme
There have been other attempts to do this, but the key thing
about RDFa is that it is generic, and although it's easy to use, it
puts RDF at the core.
more information
rdfa.info: http://rdfa.info
my blog: http://internet-apps.blogspot.com
software: http://www.swcube.com
in detail: http://www.swcube.com/rdfa
