xmllint complains about empty components

[infotroph]

$> git diff demo/easydiffs.xlsx
diff --git a/demo/easydiffs.xlsx b/demo/easydiffs.xlsx
index 4d35aa6..bb23d14 100644
-:1: parser error : Start tag expected, '<' not found
<FF><D8><FF><E0>
^
-:1: parser error : Start tag expected, '<' not found
<FF><D8><FF><E0>
^
--- a/demo/easydiffs.xlsx
+++ b/demo/easydiffs.xlsx
@@ -498,7 +498,7 @@ docProps/core.xml
   <dc:creator>Chris  Black</dc:creator>
   <cp:lastModifiedBy>Chris  Black</cp:lastModifiedBy>
   <dcterms:created xsi:type="dcterms:W3CDTF">2014-03-18T02:10:54Z</dcterms:crea
-  <dcterms:modified xsi:type="dcterms:W3CDTF">2014-03-18T02:13:50Z</dcterms:mod
+  <dcterms:modified xsi:type="dcterms:W3CDTF">2014-03-18T03:04:12Z</dcterms:mod
 </cp:coreProperties>
 docProps/app.xml
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>

First step: find out which file in the zipped directory this is coming from.