Thesis full text (PDF) - Politecnico di Milano

The user can add a new interest in his interest list by clicking on the “Add Interest” link on the
top right corner of the page. Also he can review the invitations sent from any group or sent by
another user by clicking on “View Invitation” link.
The user can also view the recommended information from the group. This information will be
available on the current user’s profile page when the current user is a member of a group and
another member from the same group added any interest to his profile. The system will
automatically recommend this information to the current user as “Recommendation from
Group”. The current user can accept this as his personal interest also by clicking on the “Accept”
link.
Figure 4.13 is showing the step by step procedure of sending a friend invitation to another user
in WebML perspective. After inserting the information corresponding to the entry form we will
create a new instance (in this case “CreateFriendInvitationIns” ) by the “Add Instance” unit and
then using the “Add Property Value” unit we will add the property value of the newly created
instance. Here, the “From User” field of the entry unit is preloaded with the current user value. If
we can create the instance and add the property value successfully we will return to “Invitation”
page otherwise if any error occurs we will go to the “Invitation Error Page”.
Figure 4.13: WebML view for an Invitation
Figure 4.14 is showing the “Invitation” page in the browser perspective i.e. it is the equivalent
representation of what we have implemented in the figure 4.13 using the components. Here, the
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