INTERVIEW QUESTIONS XML RDF DETAILS

Question: How to use Container element in RDF?

Answer: Using RDF container we can desribe the groups of things.Like: use to list artist of a movie, to create the list of author.
I have given you some RDF element(<Bag>,<Seq> and <Alt>)that are used to describe groups.

1. <rdf:Bag> Element: It is used to describe a list of values that is intended to be unordered.
<rdf:Bag> element can contain duplicate values.
Example:
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.r4r.in/cd#">
<rdf:Description
rdf:about="http://www.r4r.in/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>
2. <rdf:Seq> Element: It is used to describe a list of values that is intended to be ordered. (Example: can define values in alphabetical order).
<rdf:Seq> element can contain duplicate values.
Example:
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.r4r.in/cd#">
<rdf:Description
rdf:about="http://www.r4r.in/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>
3.<rdf:Alt> Element: It is used to describe a list of alternative values(Using this user can select only one of the values).
Example:
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.r4r.in/cd#">
<rdf:Description
rdf:about="http://www.r4r.in/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:Description>
</rdf:RDF>

Using RDF container we can desribe the groups of things.Like: use to list artist of a movie, to create the list of author.
I have given you some RDF element(<Bag>,<Seq> and <Alt>)that are used to describe groups.

1. <rdf:Bag> Element: It is used to describe a list of values that is intended to be unordered.
<rdf:Bag> element can contain duplicate values.
Example:
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.r4r.in/cd#">
<rdf:Description
rdf:about="http://www.r4r.in/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>
2. <rdf:Seq> Element: It is used to describe a list of values that is intended to be ordered. (Example: can define values in alphabetical order).
<rdf:Seq> element can contain duplicate values.
Example:
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.r4r.in/cd#">
<rdf:Description
rdf:about="http://www.r4r.in/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>
3.<rdf:Alt> Element: It is used to describe a list of alternative values(Using this user can select only one of the values).
Example:
<?xml version="1.0"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:cd="http://www.r4r.in/cd#">
<rdf:Description
rdf:about="http://www.r4r.in/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:Description>
</rdf:RDF>

Source: CoolInterview.com

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