  Linked Data technologies become increasingly important in many domains. Key
factors for their breakthrough are security and trust. Classical means for
access control lack granularity when parts of the Linked Data graph must be
protected. The WebID, combining semantic web concepts with methods from
certificate based authentication and authorization, seems promising to fulfill
all requirements concerning security and trust in the semantic web.
  In the PerSemID project, we challenged the WebID technology with a fully
implemented proof-of-concept (PoC) addressing a workflow coming from the domain
of lifelong learning and student mobility. In our use case of study enrollment,
we used WebIDs for authentication and to grant access to parts of triple
stores, during cross domain triple store interactions to exchange data between
stakeholders.
