Hi Mark,
I think I have seen a case where, while an old workspace does run via
the new build of FME, just opening and saving the workspace in a new
version breaks it. If I remember correctly, it was a
NullAttributeReplacer that I had set up to replace nulls with a single
space or a blank (or something like that). Unfortunately, I have no
idea whether the original was created in a beta version or not, and I'm
certainly not going to hold you to backwards compatibility on random
beta builds :)
In general though, if you open a workspace in Workbench and save it,
does this backwards compatibility contract go out the window? So... If
you have to modify a workspace, you have to revisit it entirely to
ensure that it's compliant with current practice? I know that old
transformers have typically continued to work in newer, edited
workspaces, as have older data sources...
Jason
-----Original Message-----
From: mark2atsafe
Subject: [fme] Re: Variables and AttributeCreator
Absolutely not. Repeat NOT. FME will always be backwards compatible, so
what you have in old workspaces will always work in a newer build.
If you have an old workspace that doesn't produce the same result in a
newer FME, then that's the time to call support and get it fixed.
As to these changes, yes we are greatly trying to remove this sort of
hack. Partly because sometimes you need to use @ or & just for their own
sake and not as functions, but also because we don't think our users
should have to do things like that.
So, as Jason said, whenever we disallow use of a function call within a
transformer, there should always be an alternate method to get the same
result. For example, there is now the FMEFunctionCaller transformer to
call a function, and the ParameterFetcher to grab the value of a
parameter (macro). Again, if there's no replacement for what you need
then it's time to call support (or ask this group for
advice)
Hope this helps to explain it all.
For insights into what's up at Safe Software and what's on the development
horizon, visit Safe's blog at spatial-etl.blogspot.com.
Safe Software has also made slides available that outline enhancements planned
for FME 2007. The slides are from the "Road Ahead" presentation given on Day 2
of the FME Worldwide Users Conference. To view these slides, visit
www.safe.com/2006uc.
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