Sequence Containers
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  * Function: RdfSeq *rdfCreateSeq(RdfElement *parent, const char *property, RdfNamespace *ns)

     Creates and returns a new sequence container.

       - parent: The parent  which will hold the sequence container.

       - property: The name of the sequence container's property.

       - ns: The sequence container's namespace.

  * Function: RdfElement *rdfSeqAddValue(RdfSeq *seq, const char *property, RdfNamespace *ns, const char *value, RdfElement *element)

     Adds and returns a property to the sequence container.

       - seq: The sequence container.

       - property: The property's name.

       - ns: The property's namespace.

       - value: The value of the property, if not NULL.

       - element: The property's element, if not NULL.