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+<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
+ <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+ <meta name="Author" content="IBM">
+ <meta name="GENERATOR" content="Mozilla/4.75 [en] (WinNT; U) [Netscape]">
+ <title>Package-level Javadoc</title>
+Support for compare and merge viewers which show the
+content side-by-side.
+Package Specification</h2>
+The <tt>ContentMergeViewer</tt> is an abstract compare and merge viewer
+with two side-by-side content areas and an optional content area for a
+common ancestor (for three-way compare). Because the implementation makes
+no assumptions about the content type it is a subclass responsibility to
+deal with a specific type.
+<p>A <tt>ContentMergeViewer</tt> accesses its model by means of a content
+provider which must implement the
+<br><tt>IMergeViewerContentProvider</tt> interface.
+<p>The <tt>TextMergeViewer</tt> is the standard concrete subclass of <tt>ContentMergeViewer</tt>.
+A text merge viewer uses the <tt>RangeDifferencer</tt> to perform a textual,
+line-by-line comparison of two (or three) input documents. For text lines
+that differ the <tt>TextMergeViewer</tt> uses an <tt>ITokenComparator</tt>
+to find longest sequences of matching and non-matching tokens. The <tt>TextMergeViewer</tt>'s
+default token compare works on characters separated by whitespace. If a
+different strategy is needed (for example, Java tokens in a Java-aware
+merge viewer), clients can create their own token comparators by implementing
+the <tt>ITokenComparator</tt> interface.
+<p>The <tt>TextMergeViewer</tt> not only works on whole documents but on
+subranges of documents too. In this case the viewer's input must be an
+<tt>IDocumentRange</tt> instead of an <tt>IDocument</tt>.

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