Stored Procedure Performance when passing in mutli-values from a SSRS Report

I'm using following method:

In SSRS values are represented as XML nodes:

<node value=19\>

<node value=62\>

All the selected nodes then passed to stored procedure as a single string, which is XML document.

<param><node value=19\><node value=62\><\param>

Standard XML shredder in TSQL converts it to a table in no time.

You may also consider storing separated values in a temp table instead of using UDF in the query.