| Template class for computing last-modified times
for content that is processed through templates.
For traditional web content that is stored in a file, it is easy to
keep track of the last time the content changed, simply by looking at the
modify-time attribute of the file. Many browsers (and caches) use
this information,
obtained from the last-modified http header to determine
whether to use an existing copy of the document, or a cached copy.
When the content is dynamically transformed, however, the last modified
time is more complex: a combination of the original file modification
time combined with the last change made to the transformation
parameters.
A new HTML tag,
<modified> is defined, and is intended to be
used in conjunction with the BSLTemplate. When present in a
page, the last-modified time of the transformation
is set to the server's current time. When the content is delivered
to the client, the last-modified header is set to the
more recent of the origin last-modified time and the transformation
modified time.
Properties:
- debug
- If this configuration parameter is present,
modified
tag is replaced by a comment. Otherwise it is removed from the document.
author:
Stephen Uhler
version:
%V% 00/12/11 |
