Data Items

A data item is a simple piece of information stored in the data payload of the item and the associated metadata. The data payload can be one of these types:

    • Animation: Video in an mp4 movie file
    • File: A generic file
    • HTML: Raw HTML source (in a <div> block)
    • Image: A PNG image
    • None: An empty item (no data payload) that can be use for tagging or other metadata purposes
    • Scene: A scene of 3D geometry
    • String: A UTF-8 string
    • Table: 2D array of doubles with row/column headers.  Can be displayed as a table or a plot (line, bar, pie, ...)
    • Tree: A collection of name/value pairs organized as a tree

All data items know how to generate the HTML snippets necessary to display themselves when asked. See individual items for their display details.

Common Data Item Metadata

In addition to the data payload, all data items include a common collection of metadata attributes.  These include:

    • The session Item describes the application that stored the data item
      • hostname (50 characters)
      • session tags (250 characters)
      • application name (40 characters)
      • date/time
      • platform (50 characters)
      • version (20 characters)
    • The dataset item describes the data source of the item
      • filename (250 characters)
      • directory name (250 characters)
      • data format (50 characters)
      • dataset tags (250 characters)
    • Date/Time
    • Specific item tags (250 characters)
    • The name of the source of the item (80 characters)
    • A sequence number (for sorting, etc)
    • The name of the data item (80 characters)



Created with the Personal Edition of HelpNDoc: Write EPub books for the iPad