Mashups in Presto Wires : Creating Mashups in Wires : Add Actions or Other Blocks : Create a Document for Input
Create a Document for Input
 
Add Fields or Structure Nodes
Map Other Results to the Output
Enter or Calculate Data
The Document block creates a well-formed document that you can use to supply data for properties in other blocks.
For example, some web services or web sites that you invoke using DirectInvoke require a username and password passed as a header. But DirectInvoke has only a single property to define the header. You can use Document to build the complex document for this header and then assign it to the header property for the DirectInvoke block.
To define a document
1. Drag Document onto the canvas.
The Block Properties for this action displays two panes with a pane where you build the document structure and a pane with properties you can assign to the currently selected node or field.
Tip:  
It helps to maximize the Block Properties/Preview panel with the button while you work with both structures.
The output structure can contain:
* = a root or structure node that contains children but does not repeat. The root node completely wraps the entire document of the results.
* = a repeating node, usually with children.
* = a field (node) that contains data. If the node name begins with @ this is an XML attribute. Otherwise it is an XML element.
2. Change the name for the root node, if desired, in the Document Node Settings field.
3. Build the output document under the root node and define what data should populate the results: You can:
*Add Fields or Structure Nodes for more control over the structure and order. Then use node properties to populate data.
*Map Other Results to the Output to populate data in the output structure.
*Enter or Calculate Data for output fields. You can enter literal data or use functions to calculate data.
*Delete output nodes: select the output node and click .
*Rename nodes: enter a new name in the Document Node Settings field.
Node names must be valid XML names, starting with a letter and containing only letters, numbers, periods(.), underscores (_) or dashes (-).
*Copy/paste node property settings from one output node to another with the and buttons in the Output Structure toolbar.
4. Use Run to preview the results as needed.
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