Session catalog

The session catalog is the material catalog which provides session attributes for the request, and 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