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I'm working in a powershell scrip for F4SP 2010 server that reads lines from a .csv file and creates the mappings between managed properties a crawled properties.

I don't have much problem, just a question.

I found that categories can have multiple Guids mapped to them, I wanted to retrieve the Guid associated to a category, so I could be more specific in the crawled property search, without depending on Guid from the category, but I found that from the name of the category I cannot get a Guid.

The primary purpose of getting it is that, if I do not find a crawled property with Guid and Name specified in the .csv, I create a new one using New-FASTSearchMetadataCrawledProperty, for what I need the propset Id.

Do anyone knows why a category has multiple Guids?

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Could you explain what you mean by a category? Usually property sets and crawled property categories are spoken of as one and the same. – Mikael - SharePoint MVP Jan 26 '12 at 18:24
Well I'm too new, and probably I don't know how to explain exactly, but, a crawled property is created with a Name, a PropsetId and a Variant Type, the object crawled property has a property called CategoryName this, CategoryName is the name of a Category... – Amedio Jan 26 '12 at 20:33
Ok, and that CategoryName corresponds to the guid in Propset. There are many crawled properties in one category/property set. So a category (or propertyset) will have many crawled properties mapped to it. The identifier for a crawled property is: name/id+varianttype+category(propset). When creating a new crawled property manually you can create it in either of the pre-existing categories(propertysets) or create a new category with a guid of your own choosing. Hope this clarifies it a bit. – Mikael - SharePoint MVP Jan 27 '12 at 7:44
Yes, but, I found a CategoryName can be mapped to several propsetIds, so what I'm asking is, why this is like this? :) – Amedio Jan 27 '12 at 7:48
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You are right indeed. Never noticed. If you try to create a new category you cannot use the same Name and different propset guid. I see from the internal implementation that the propsets are a collection on the category. I see SharePoint has 3 mappings and Office has two. And I have no idea why this is. – Mikael - SharePoint MVP Jan 27 '12 at 14:44
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