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While browsing the source code of the Scala API, I met this package definition in scala/tags/R_2_8_0_final/src/library/scala/util/parsing/combinator/syntactical/StdTokenParsers.scala:
package scala.util.parsing package combinator package syntactical What does that mean? That the class will be available in more than one package?
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Packaging is a subset of marketing where a brand designs and develops the wrapper or container to aid its transport, handling, delivery, and communicate the brand and product information by making it look attractive.
Definition. Family packaging refers to the use of one design or other key packaging element to integrate the packaging of two or more individual items (for example, a personal care line that includes shaving cream, after-shave and antiperspirant).
Kaleidoscopic packaging is concerned with printing suitable and attractive cut-out figures, toy and cartoons on the package in order to attract the consumer and stimulate the demand. Pictures of fresh and juicy vegetables, fruits on ready to eat items give an impression of a healthy product.
This is basically the same as
package scala.util.parsing.combinator.syntactical import scala.util.parsing._ import scala.util.parsing.combinator._ ... So by "stacking" the packages the way you wrote you can get super-packages in scope. See also these answers.
[Update] Here is a new article written by Martin Odersky about this topic: http://www.artima.com/scalazine/articles/chained_package_clauses_in_scala.html
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The Scala reference mentions (chapter 9, section 9.1):
A compilation unit consists of a sequence of packagings, import clauses, and class and object definitions, which may be preceded by a package clause.
A compilation unit
package p1; ... package pn; statsstarting with one or more package clauses is equivalent to a compilation unit consisting of the packaging
package p1 { ... package pn { stats } ... }
See also Organizing Code in Files and Namespaces on nested packages.
(From Programming Scala: Scalability = Functional Programming + Objects By Dean Wampler, Alex Payne, page 44, Chapter 2)
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