The DocList object wraps a list in a document-oriented
interface that is shared with '>DocDataFrame. This
is mostly to achieve an abstraction around tabular and list
representations of documents. DocList should behave just like a
list, except it adds the accessors described below.
These are some accessors that DocList adds on top of the
basic list accessors. Using these accessors allows code to be
agnostic to whether the data are stored as a list or data.frame.
ndoc(x): Gets the number of documents (elements)
nfield(x): Gets the number of unique field names over all
of the documents
ids(x), ids(x) <- value: Gets or sets the document unique
identifiers (may be NULL, treated as names)
fieldNames(x, includeStatic=TRUE, ...): Gets the set of
unique field names
meta(x): Gets an auxillary list of “meta” documents
(lists) that hold fields that describe, rather than compose, the
actual documents. This feature should be considered unstable. Stay
away for now.
unmeta(x): Clears the metadata.
'>DocDataFrame for representing a document collection as
a table instead of a list