I am trying to set the the source field of a template using the query notation (or xpath - whichever works), but none of them seems to be working.

My content tree is a multisite content tree:

France
--Page 1
----Page1A
-------Page1AA
--Page 2
--Page 3
--METADATA
----Regions

US
--Page 1
----Page1A
-------Page1AA
--Page 2
--Page 3
--METADATA
----Regions

Each site has its own METADATA folder, and I want it so that when adding a page inside each of the main country nodes, I want the values to reflect whatever is in the METADATA of that site. I have two different fields for now - a droplink and a treelistex field. So I thought I can just get the parent item that is a country site, and get the metadata folder for that. When I put the following query in both the fields, I get different results:

 query:./ancestor::*[@@templatename='CountryHome']/METADATA/Regions/*

For the droplink field, I get only the first Region (one item)
For the treelistex field, I get the entire content tree

I then tried to modify the query a little bit and took the 'query' notation out

 ./ancestor::*[@@templatename='CountryHome']/METADATA/Regions/*

If I go to the developer center/xpath builder, and set the context node to any item underneath the main country site, it returns me exactly what I need, but when I put this in the source, I get the entire content tree in both the cases.

Help!

What you have here should work with the Droplink field. Perhaps you are referring to Droptree?

query:./ancestor::*[@@templatename='CountryHome']/METADATA/Regions/*

As for the TreelistEx, I don't think the default Treelist fields support Sitecore query. However, this article describes how to create a custom TreeList that supports it.

Stephen Pope

Fields that support Sitecore Query

Where you can use the syntax query: or fast: (for FastQuery):

Droplist
Grouped Droplist
DropLink
Grouped Droplink
Checklist
Multilist
Droptree

Fields that support Parameterized Datasource

Where you can use enhanced syntax with Parameterized datasource query:

Droptree †
Treelist
TreelistEx

† Droptree only supports the Datasource and DatabaseName parameters.

The enhanced query string syntax includes the following parameters:

Datasource
DatabaseName
AllowMultipleSelection
IncludeItemsForDisplay
ExcludeItemsForDisplay
IncludeTemplatesForSelection
ExcludeTemplatesForSelection
IncludeTemplatesForDisplay
ExcludeTemplatesForDisplay

These are used like this: Datasource=/sitecore/content/home/Products/&IncludeTemplatesForDisplay=Product Category&ExcludeTemplatesForSelection=Product Description&IncludeTemplatesForSelection=Product Category

Mark Ursino has a great post on how to use this kind of syntax here.

来源：https://stackoverflow.com/questions/12611258/query-notation-for-the-sitecore-source-field-in-template-builder

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