How about that:
1. Read the document and strip off everything except the html tags, including all newlines;
2. Take the MD5 hash of the tag structure;
3. Compare the MD5s of the documents to determine if they have the same structure. Or are derived from the same template with different text.
Advantadges:
* Accounts for markup changes, so differences in the text are not significant;
* If you have a lot of documents, MD5s are easy and quick to compare, as opposed to whole documents.
Disadvantadges:
* Accounts for markup changes, so differences in the text are not significant;
* MD5s are very strict, so there's no telling between small and big differences.
Actually this isn't my idea, it was used in some web survey to count the number of unique sites on the net.
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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