title: Importing two functions with same name using roxygen2
body: <p>I'm a maintainer of a CRAN package and get the following messages when loading:</p>
  
  <pre><code>* checking whether package ‘qdap’ can be installed ... [10s/10s] WARNING
  Found the following significant warnings:
    Warning: replacing previous import ‘annotate’ when loading ‘NLP’
    Warning: replacing previous import ‘rescale’ when loading ‘scales’
  </code></pre>
  
  <p>Because I use the plotrix and scales packages as well as the NLP and ggplot packages.  They have the functions <code>rescale</code> and <code>annotate</code> in common.  This results in a significant warning with the latest CRAN check.  So I decide to "fix" it.</p>
  
  <p>I made the description something like this:</p>
  
  <pre><code>Package: qdap
  Type: Package
  Title: Bridging the gap between qualitative data and quantitative analysis
  Version: 1.0.0
  Date: 2013-06-26
  Author: Tyler Rinker
  Maintainer: Tyler Rinker &lt;tyler.rinker@gmail.com&gt;
  Depends:
      R (&gt;= 3.0.0),
      ggplot2 (&gt;= 0.9.3.1),
      gdata,
      grid,
  Imports:
      NLP,
      openNLP,
      plotrix,
      scales,
  LazyData: TRUE
  Description: Stuff
  License: GPL-2
  </code></pre>
  
  <p>And added this to some .R files:</p>
  
  <pre><code>#' @import ggplot2 gridExtra RColorBrewer
  #' @importFrom scales alpha
  </code></pre>
  
  <p>But this results in another warning:</p>
  
  <pre><code>* installing *source* package 'qdap' ...
  ** R
  ** data
  *** moving datasets to lazyload DB
  ** inst
  ** preparing package for lazy loading
  Warning: replacing previous import 'rescale' when loading 'scales'
  Warning: replacing previous import 'annotate' when loading 'NLP'
  Warning: replacing previous import 'alpha' when loading 'scales'
  </code></pre>
  
  <p>How do I use <code>roxygen2</code>'s <code>importFrom</code> tag correctly?</p>
  
  <p>I have read: <a href="https://github.com/hadley/devtools/wiki/Namespaces" rel="noreferrer">https://github.com/hadley/devtools/wiki/Namespaces</a></p>
  
  <p>But I learn best from an example where someone had to do this.  I'm unsure of how to format the DESCRIPTION file correctly as well as the use of <code>roxygen2</code> tags to avoid:</p>
  
  <pre><code>* checking whether package ‘qdap’ can be installed ... [10s/10s] WARNING
  Found the following significant warnings:
    Warning: replacing previous import ‘annotate’ when loading ‘NLP’
    Warning: replacing previous import ‘rescale’ when loading ‘scales’
  </code></pre>
  
  <p>Here is the <a href="https://github.com/trinker/qdap" rel="noreferrer">qdap GitHub Repo</a></p>