The general form of a COLLAPSE is given below.
COLLAPSE collapses a path,
represented by the variable,
to a single edge.
How each property in the path is collapsed depends on the semantics
of the property.
Collapsing the NAME property
The NAME property is collapsed by concatenating names.
The PROPERTY operation does an implicit
COLLAPSE, so the following query is effectively equivalent to the one
|The names of paths to all nodes.:
Note that the NAME of a root edge is missing ('@').
|The names of paths to all nodes redux.:
The SECURITY property is collapsed by determining which
certificates are needed.
|The security on paths to all nodes.:
Note that many¨nodes are reachable without any security.
Collapsing transaction time
The TRANSACTION TIME property is collapsed using temporal intersection.
|The security and transaction time for all nodes.:
Other properties, such as QUALITY, are also collapsed.
|The security, transaction time, and quality for all nodes.:
Curtis E. Dyreson,
Michael H. B÷hlen, and
Christian S. Jensen
© 1998-2000. All rights reserved.