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+2021-01-01 Jay Berkenbilt <ejb@ql.org>
+
+ * Add methods to QPDFPageObjectHelper: forEachXObject,
+ forEachImage, forEachFormXObject to call a function on each
+ XObject (or image or form XObject) in a page or form XObject,
+ possibly recursing into nested form XObjects.
+
+ * Add method QPDFPageObjectHelper::getFormXObjects to return a map
+ of keys to form XObjects (non-recursively) from a page or form
+ XObject.
+
+ * Add method QPDFObjectHandle::isImage to test whether an object
+ is an image.
+
2020-12-31 Jay Berkenbilt <ejb@ql.org>
* QPDFPageObjectHelper::removeUnreferencedResources can now be