Recommendations for nested, external, or subprojects (ala svn:externals)?

[Nathan Fiedler]

I'm trying to advocate the use of Hg within my team at work, but almost
immediately encountered a challenge. The response was, "how do we link to
external source repositories, as is done with svn:externals in Subversion?"
In particular, with Rails development, it is quite common to use
svn:externals to pull down code for a particular revision of a plugin. Being
that I am very new to Mercurial, I don't know of any answers for this.

Does anyone have recommendations for how to work with external projects?
That is, say I want to have my code in Hg but also want to make it easy to
include code from other projects, which may be stored in one or more
Subversion, or Hg, repositories.

Thanks

n
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