## 2 Analysis of the State of the Art
### The Moving Picture Experts Group  
The Moving Picture Experts Group (MPEG) is a working group of ISO/IEC with the mission to develop standards, e.g., MPEG-ACC, MPEG-H, MPEG-DASH, MPEG-4,... for coded representation of digital audio and video. The group has produced several standards that help the industry offer end users an ever more enjoyable digital media experience. As this group keeps working on the cited objectives the 108 meeting is scheduled March 2014 in Valencia, Spain [85].  
The mission of the Internet Engineering Task Force (IETF) is to produce high quality and relevant technical documents that influence people to design, use, and manage the Internet. IETF's standards  
\begin{table}
\begin{tabular}{l l l} \hline
**Document** & **Type** & **Details** \\ \hline PROV-PRIMER [86] & Note & The entry point to PROV offering an introduction to the provenance data model \\ PROV-XML [87] & Note & Defines an XML schema for the provenance data model PROV data model \\ PROV-O [88] & Rec. & PROV-O defines a light-weight OWL2 ontology for the provenance data model \\ PROV-DM [89] & Rec. & Defines a conceptual data model for provenance including UML diagrams. \\  & & PROV-O, PROV-XML and PROV-N are serializations of this conceptual model \\ PROV-N [90] & Rec. & Defines a human-readable notation for the provenance model. \\ PROV-CONSTRAINTS [91] & Rec. & Defines a set of constraints on the PROV data model that specifies a notion of valid provenance \\ PROV-AQ [92] & Note & Defines how to use Web-based mechanisms to locate and retrieve provenance information \\ PROV-DC [93] & Note & Defines a mapping between Dublin Core and PROV-O \\ PROV-DICTIONARY [94] & Note & Defines constructs for expressing the provenance of dictionary style data structures \\ PROV-SEM [95] & Note & Defines a declarative specification in terms of first-order logic of the PROV data model \\ PROV-LINKS [96] & Note & Defines extensions to PROV to enable linking provenance information across bundles of provenance descriptions \\ \hline \end{tabular}
\end{table}
Table 6: PROV documents description. Document type (Recommendation or Note) is also shown.  
\begin{table}
\begin{tabular}{l l} \hline
**Working Group** & \\ \hline Applications Area Working Group & \\ Constrained RESTful Environments & \\ Extensible Provisioning Protocol Extensions & \\ Hypertext Transfer Protocol Bis & \\ BiDirectional or Server-Initiated HTTP & \\ JSON data formats for vCard and iCalendar & \\ JavaScript Object Notation & \\ Protocol to Access WS database & \\ Preparation and Comparison of Internationalized Strings & \\ IMAP QRESYNC Extension & \\ System for Cross-domain Identity Management & \\ SPF Update & \\ Uniform Resource Names, Revised & \\ Using TLS in Applications & \\ Web Security & \\ Web Extensible Internet Registration Data Service \\ \hline \end{tabular}
\end{table}
Table 7: Active IETF Working Groups.  
development work is organized into 8 areas. Within each area there are multiple Working Groups. Each Working Group has one or more chairs who manage the work, and a written charter defining what the work is and when it is due. Table 7 shows the current active IETF Working Groups. The next meeting is scheduled for March, 2014 in London, England.