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")
  • ​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 ​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 - ​List of publications
  • finish skiptrax ontology (see ​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