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Session catalog

The session catalog is the material catalog which provides session attributes for the request, as well as a default catId value for all src=, vignette=, and icc= commands.
The session catalog is specified as the first path element of the HTTP request path (immediately following the server name). If the first path element does not match attribute::RootId of any catalog, the default catalog is used as a session catalog.
The session catalog provides the following session default values:
Attribute
Notes
attribute::RootPath
Root path for material data files
attribute::VignettePath
Root path for vignette files
attribute::IccProfileRgb
Default working color space if a vignette does not embed an ICC profile
attribute::RootUrl
Root URL for relative HTTP file paths in src= commands
attribute::ShowOverlapObjs
Initial show/hide state for overlap objects
attribute::Expiration
Time-to-live value of the reply image for proxy server and browser caches
attribute::MaxPix
The maximum allowed reply image width and height
attribute::DefaultPix
Default values for wid= and hei=
attribute::Format
Default value for fmt=
attribute::JpegQuality
Default value for qlt=
attribute::TiffEncoding
Compression type for TIFF image output
attribute::Sharpen
Default value for sharpen=
attribute::OnFailSel
Specifies behavior when a sel= command fails
attribute::OnFailObj
Specifies behavior when an obj= command fails