This statement constructs a well-formed document, wrapped in a root node, and assigns it to an input or output parameter or to a variable. You define the structure as literal XML and assign static data or use dynamic mashup expressions to assign data dynamically.

It is a good practice to use a separate namespace for the elements in the structure being constructed, so that they are clearly separated from EMML markup.

See Construct the Complete Document and Construct the Root and Append Repeated Content for examples of the two common patterns used with <constructor>. See also Working Samples for information on sample mashups that use this statement.