Include content only once — singleton
singleton(x, value = TRUE) is.singleton(x)
Arguments
x |
|
|---|---|
value |
Whether the object should be a singleton. |
Description
Use singleton to wrap contents (tag, text, HTML, or lists) that should
be included in the generated document only once, yet may appear in the
document-generating code more than once. Only the first appearance of the
content (in document order) will be used.