Appendix : Legacy Presto components : Mashables and Mashups : Mashups in EMML : Writing Mashups in EMML : Combining Component Mashable or Mashup Results : <join> : <select>
<select>
Optionally, defines the literal XML structure and specific nodes or computations to include in the result of the join. If this is omitted, all nodes matching the join condition are included in the result.
Note:  
The structure inside <select> must be well-formed, starting with a root node, that is repeated for each included node. Elements in the structure should use a namespace, so that they are clearly separated from EMML markup. CDATA sections are allowed to contain the structure but are deprecated.
Can Contain
Can contain text and any well-formed literal XML. Data can be literal text or assigned with dynamic mashup expressions.
Attributes
Name
Required
Description
name
yes
The name to assign to the root node enclosing all selected results for the join.
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