i used mechanize.pm as an example

Then you're seeking a generic answer and I had already given that.

it would break if you move mechanize.pm into another directory not named www

Correct, you are not free to change the directory structure, just to copy or move it. (At least, not without making additional changes.) Your library directory is .../lib/, not .../lib/WWW/.

And if you do move (for example) mechanize.pm into a directory not named www and try to "use mechanize" instead, hopefully it still works and doesn't break ISA?

In general, this won't work because the module's import won't get found. Again, you are not free to change the directory structure, just move it.

In reply to Re^5: are installed modules relocatable? by ikegami
in thread are installed modules relocatable? by perl5ever

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.