Miscellaneous steps, which are usually used for housekeeping purposes in the pipeline.
p:cast-content-type - Changes the media type of a document.
p:compare - Compares documents for equality.
p:count - Count the number of documents.
p:set-properties - Sets or changes document-properties.
p:sink - Discards all source documents.
p:split-sequence - Splits a sequence of documents.