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== Random ideas ==
 * '''Refactoring'''
   * virtual Feature Type instances for nonbinary feature types
     * pro: Don't have to handle nonbinary features as a special case all over the frontend code
     * con: Breaks clean object<->RDF mapping. ft.getSubclasses() suddenly needs Item as parameter. Eventually has to consider Trust. Not straightforward to implement.
   * Syncer should implement and use !ModelListener
     * pro: less resource consumption, proper diff handling
     * needs lots of rewriting
   * One Model per Skipforward webapp (new). Many users per Skipforward webapp (done).
     * pro: Less resource consumption (memory/filetransfers)
     * con: Syncer needs to know with whom to sync. Not trivial (what if one user moves from SF server A to SF server B?). Privacy issues (FactsDb needs to check resources it accesses against namespaces that are supposed to be visible to the user - has to trust XMPP server).
 * '''User interface'''
   * Plain HTML pages for item/feature instances, just for browsing and linked data
     * support RSS feeds
     * For ''Item types'': Comment, Instance list (by date/...)
     * For ''Person instances'': Trust, feature(types) I (dis)agree with, last annotations, list of annotated items (by date/...)
     * For ''Item instances'': Review stats, list of annotators (by degree of agreement), list of feature instances (by date/...)
     * For ''Feature types'': Comment, example positive/negative item instances (by number of annotations), experts for this type, dispute list (for the current item), list of instances (for the current item)
     * For ''Feature'': -
     * For ''Recommendation'': List of recommended items
 * '''Annotating items'''
   * Rules for deducing features (per-user basis, let user confirm generated feature instances)
   * Filter negative features in view
 * '''Adaptation for music domain'''
   * simplify entering song/band information - 1 week
   * download/cache songs - 1-4 weeks
   * generate/play playlists, possibly with changing style over time (AutoDJ) - 2-6 weeks
 * '''Metadata sharing'''
   * optimize synchronization - 2-3 weeks
   * cache and forward data on intermediate nodes in a secure fashion - 3-8 weeks
   * superpeer nodes? Possibly represented within the network? (superpeer3-hasFeature-!IsHubForMusic) - 3-8 weeks
   * detect 'hot topics'
 * '''Trust network''' - trust as in "peer is competent/peer's metadata is important")
   * [http://www.informatik.uni-freiburg.de/~dbis/Publications/04/EEE04.html Spreading Activation Models for Trust Propagation]
   * explicit representation of trust (see Skippies ontology) - 2-5 weeks
     * user interface changes for that
     * trust metric changes for that
 * '''Ontology evolution'''
   * simple skipinions ontology editor - 2 weeks
   * update and synchronize ontologies (and facts!) on peers - 3-8 weeks
 * '''User interface'''
   * proper search/view/enter
   * evaluation

== Implementation details ==
 * '''Facts/graph synchronization''' idea
   * every peer implements
     * {{{String getDiffForNamespace(String namespace, String haveHash, String wantHash)}}}
     * {{{String getMostCurrentHash()}}}
     * {{{String isValid(String hash)}}}
     * {{{String getPubkey()}}}
     * {{{? subscribe(?)}}}
   * logic: once a day, every machine dumps its 'own' facts to an NTriples file along with a timestamp and the data's hash
   * when peers call {{{getDiffForNamespace()}}}, a diff from ''haveHash.dat'' to ''wantHash.dat'' is calculated and sent
   * Distributed Storage
     * simple distributed storage (without signatures) with trust can be implemented usind {{{getMostCurrentHash}}} and {{{isValid}}}
     * distributed storage with signatures can be implemented with {{{getPubkey}}} (using a true keyserver might be desirable though)
     * optimized push synchronization could use some subscription mechanism. Integrate with [http://www.xmpp.org/extensions/xep-0060.html XMPP pubsub]?
   * Ontology evolution/rules
     * rules that upgrade existing facts could be added to the diff file

== Done ==
 * '''Internal namespaces for ontologies''' ({{{xmpp://schwarz@xmpp.km.opendfki.de/ont/ludopinions#UsesDice}}})
   * this way people can create own ontologies, and ontology management/evolution can be done similar to facts synchronization
 * Play sounds from !JavaScript: http://www.schillmania.com/projects/soundmanager/
 * show number of (existing) feature instances for each item (in !ItemPane) - metadata certificates
 * show number of feature instances for each feature class (in !FeaturePane) and arithmetic mean/standard deviation for applicability - metadata certificates
 * red/green blobs
 * RDF importer that changes namespaces
 * FloriansDiplomaThesis topics (Jul-Dec 2008)
   * related work: Semantic audio - [http://www.semanticaudio.org/htmls/publications.html List of publications]
   * finish skiptrax ontology (see [http://musicontology.com/ Music Ontology])
   * metadata importers/exporters (ID3, LastFM, etc.)
   * expert recommender (ask friends about people having knowledge about X/interests in Y)
   * scalable trust metric
   * fast computation of feature summaries