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## 4.3. Comparing Bookmarks

### Quantity

The simplest comparison related to bookmarks is to compare the number of bookmarks in two documents:

    @Test
    public void haveSameNumberOfBookmarks() throws Exception {
      String filenameTest = "documentUnderTest.pdf";
      String filenameReference = "reference.pdf";

      AssertThat.document(filenameTest)
                .and(filenameReference)
                .haveSameNumberOfBookmarks()
      ;
    }

### Bookmarks with Properties

Next, the bookmarks and their properties are compared. Bookmarks of two PDF documents are 'equal' if the following attributes have the same values:

- label (title)

- destination (URI)

- destination (related page)

- destination (link name)

    @Test
    public void haveSameBookmarks() throws Exception {
      String filenameTest = "documentUnderTest.pdf";
      String filenameReference = "reference.pdf";

      AssertThat.document(filenameTest)
                .and(filenameReference)
                .haveSameBookmarks()
      ;
    }

If you are uncertain about the bookmarks, all bookmark data can be extracted into an XML file using the utility `ExtractBookmarks`. This file can easily be analyzed. See chapter 9.5: “Extract Bookmarks to XML”.

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