p:sink (3.1) 
Discards all source documents.
Summary
<p:declare-step type="p:sink"> <input port="source" primary="true" content-types="any" sequence="true"/> </p:declare-step>
The p:sink step discards all documents that appear on its source port.
Ports:
Port | Type | Primary? | Content types | Seq? | Description |
|---|---|---|---|---|---|
|
|
|
|
| The document(s) to discard. |
Description
The p:sink step eats all documents that appear on its source port and makes them disappear.
This step is a bit of a left-over from bygone days. In XProc 1.0, primary output ports had to be connected to something. So if you
didn’t need the output of some step you had to discard its results by using p:sink. Starting XProc 3.0 this is no longer the case:
primary output ports that are not connected discard their outputs automatically. The only reason to use p:sink nowadays is to make this more
explicit.
Reference information
This description of the p:sink step is for XProc version: 3.1. This is a required step (an XProc 3.1 processor must support this).
The formal specification for the p:sink step can be found here.
The p:sink step is part of categories:
The p:sink step is also present in version:
3.0.