RDF container
RDF container is used to describe a set of things. For example, list the authors of a certain book together.
The following RDF elements are used to describe these groups: <Bag>, <Seq>, and <Alt>.
h2><rdf:Bag> Element
<rdf:Bag> The element is used to describe a list of values specified as unordered. The
<rdf:Bag> element can contain repeated values.
Example
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http:/ /www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#">
< ;rdf:Description
rdf:about="http://www.recshop.fake/cd/Beatles">
<cd:artist>
<rdf:Bag>
<rdf:li>John</rdf:li>
<rdf:li>Paul</rdf:li>
<rdf:li>George</rdf:li>
<rdf:li>Ringo</rdf:li>
</rdf:Bag>
</cd:artist>
</rdf:Description>
</rdf:RDF>
<rdf:RDF
xmlns:rdf="http:/ /www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#">
< ;rdf:Description
rdf:about="http://www.recshop.fake/cd/Beatles">
<cd:artist>
<rdf:Bag>
<rdf:li>John</rdf:li>
<rdf:li>Paul</rdf:li>
<rdf:li>George</rdf:li>
<rdf:li>Ringo</rdf:li>
</rdf:Bag>
</cd:artist>
</rdf:Description>
</rdf:RDF>
##<rdf:Seq> ; Element <rdf:Seq> The element is used to describe a list of values that is specified as ordered (such as an alphabetical sort). The <rdf:Bag> element can contain repeated values. Example
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http:/ /www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#">
< ;rdf:Description
rdf:about="http://www.recshop.fake/cd/Beatles">
<cd:artist>
<rdf:Seq>
<rdf:li>George</rdf:li>
<rdf:li>John</rdf:li>
<rdf:li>Paul</rdf:li>
<rdf:li>Ringo</rdf:li>
</rdf:Seq>
</cd:artist>
</rdf:Description>
</rdf:RDF>
The
#RDF Terminology
<rdf:RDF
xmlns:rdf="http:/ /www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#">
< ;rdf:Description
rdf:about="http://www.recshop.fake/cd/Beatles">
<cd:artist>
<rdf:Seq>
<rdf:li>George</rdf:li>
<rdf:li>John</rdf:li>
<rdf:li>Paul</rdf:li>
<rdf:li>Ringo</rdf:li>
</rdf:Seq>
</cd:artist>
</rdf:Description>
</rdf:RDF>
<rdf:Alt> element
<rdf:Alt> element is used for a list of replaceable values (the user can select only one of these values) .
Example
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http:/ /www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#">
< ;rdf:Descriptio
rdf:about="http://www.recshop.fake/cd/Beatles">
<cd:format>
<rdf:Alt>
<rdf:li>CD</rdf:li>
<rdf:li>Record</rdf:li>
<rdf:li>Tape</rdf:li>
</rdf:Alt>
</cd:format>
</rdf:Descriptio>
</rdf:RDF>
<rdf:RDF
xmlns:rdf="http:/ /www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#">
< ;rdf:Descriptio
rdf:about="http://www.recshop.fake/cd/Beatles">
<cd:format>
<rdf:Alt>
<rdf:li>CD</rdf:li>
<rdf:li>Record</rdf:li>
<rdf:li>Tape</rdf:li>
</rdf:Alt>
</cd:format>
</rdf:Descriptio>
</rdf:RDF>
#RDF Terminology
In the above example, we have discussed "list of values" when describing the container element. In RDF, these "lists of values" are called members. Therefore, we can say:
- A container is a resource that contains things
- The contained things are Called a member (not a "list of values").
