Access custom metadata from another plugin

I was wondering if it would be possible to access the custom metadata from one plugin from another plugin.
I know you use the _PLUGIN object when you read or write the metadata with a plugin.Is there any way to pass the varible to another plugin, maybe stored in a xml or text file in the modules folder? I also see where you can use the "unique identifying string" or plugin.id. Is this id differant for every installation of Lightroom?

Allen, I'm pretty sure the answer is no - you can't access another plug-in's custom fields.
I'm sure I have read this limitation somewhere - even if I can't now see it stated explicitly in the documentation. If anything, the docs imply getPropertyForPlugin can do so by specifying the LrToolkitIdentifier value (which you may be able to pass as a preference). So this doesn't work:
getData = photo:getPropertyForPlugin("uk.co.beardsworth.missing", jbMissing )
It is an important point though that one plug-in should be able to access another's custom fields. Obviously one can think of many ordinary circumstances where it would be handy, but I'm more worried about the longer term DAM viability of custom metadata. Let's say I decided to release a plug-in based around custom fields and users entered metadata which had some value to them - whether that's just input time or business data (eg client or agency account number). Now move on to LR3 and the plug-in no longer works - I've disappeared, driven mad by SDK changes, or you're unwilling to pay my extortionate plug-in upgrade fee.
Now what happens to that valuable metadata? The data is still in the database but you can't read it because the original plug-in's unavailable, and Adobe's built-in "All" Plugin Metadata panel only shows data from enabled plug-ins. It's not in the XMP either. You're stuffed - unless you're resourceful enough to reverse engineer chunks of the plug-in. Assuming that I encrypted my plug-in's code, that means you're going to have to dig around the SQL to figure out my plug-in's ID and its field names. Only then can you create a plug-in to rescue your custom data. And you've got to hope to hell that my plug-in didn't encrypt or obscure the values you entered.
For me what this shows is
1) You're taking a big risk if you store valuable custom metadata - if you can't sort it out yourself, should you do it?
2) You should ensure any plug-in with custom metadata stores its field definitions in unencrypted files
3) The All Plug-in Metadata panel needs to show all plug-in metadata
4) The SDK should allow you to get custom metadata from other plug-ins
4) Custom fields should be mapped to XMP
Short answer - No.
John

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I was able to boil it down to the following problem but I'm still stuck on how to solve the situation:
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