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diff --git a/includes/image_io/xml/xml_handler.h b/includes/image_io/xml/xml_handler.h
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--- a/includes/image_io/xml/xml_handler.h
+++ /dev/null
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-#ifndef IMAGE_IO_XML_XML_HANDLER_H_  // NOLINT
-#define IMAGE_IO_XML_XML_HANDLER_H_  // NOLINT
-
-#include "image_io/base/data_match_result.h"
-#include "image_io/xml/xml_token_context.h"
-
-namespace photos_editing_formats {
-namespace image_io {
-
-/// The handler that is called by XmlRule instances as they parse XML syntax
-/// and produce tokens defined in the XmlTokenContext. Each handler function
-/// may be called multiple times with different XmlPortion values. The first
-/// time the XmlPortion::kBegin bit will be set. The last time, XmlPortion::kEnd
-/// will be set. In between, XmlPortion::kMiddle will be set. If the entire
-/// token value is available for the handler, all three bits will be set.
-/// The implementation of each function in this base class returns the
-/// DataMatchResult value that the context provides. The function overrides in
-/// subclasses can return the same context value, or a copy that is modified
-/// with a different result type, message and "can continue" flag.
-class XmlHandler {
- public:
-  virtual ~XmlHandler() = default;
-
-  /// This function is called to start an XML element. Once started, any of
-  /// the other handler functions may be called.
-  /// @param context The token context used to specify the element name.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult StartElement(const XmlTokenContext& context);
-
-  /// This function is called to finish an XML element. Each call to this
-  /// function should be paired with a call to a StartElement function.
-  /// @param context The token context used to obtain the match result for
-  /// returning. For this function, the context might not have a valid token
-  /// value: the XmlPortion will always be kNone and the token range invalid.
-  /// This is the case if the syntax parsed is an empty element like this:
-  /// "<SomeElement [Attribute=Name]... />". For non empty elements with syntax:
-  /// "<SomeElement>...</SomeElement>", the value will be the element name.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult FinishElement(const XmlTokenContext& context);
-
-  /// This function is called to define an attribute name. This function will
-  /// never be called unless an element has been started with a prior call to
-  /// the StartElement() function.
-  /// @param context The token context used to specify the attribute name.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult AttributeName(const XmlTokenContext& context);
-
-  /// This function is called to define an attribute value. The token value
-  /// passed to this function always includes the quote marks at the begin and
-  /// end of the token value. The quote marks always match and may be either a
-  /// single quote (') or a double quote ("). Sometimes attribute values can be
-  /// very long, so implementations of this function should use care if they
-  /// retain the value as a string for later processing. This function will
-  /// never be called unless an element has been started with a prior call to
-  /// the StartElement() and AttributeName() functions.
-  /// @param context The token context used to specify the attribute value.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult AttributeValue(const XmlTokenContext& context);
-
-  /// This function is called to define a block of characters in the body of
-  /// an element. This function may be called multiple times for a given
-  /// element. Handlers that are interested in the character content for an
-  /// element should concatenate the token values from all calls to obtain the
-  /// full value for the element.
-  /// @param context The token context used to specify the content value.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult ElementContent(const XmlTokenContext& context);
-
-  /// This function is called to inform the handler of a comment. A comment in
-  /// XML has the syntax "<!--...-->". In order to simplify the XML parsing
-  /// task, the tokens passed to this function never include the leading "<!--"
-  /// characters, but always include the trailing "-->".
-  /// @param context The token context used to specify the comment.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult Comment(const XmlTokenContext& context);
-
-  /// This function is called to inform the handler CDATA block. A CDATA block
-  /// in XML has the syntax "<![CDATA[...]]>". In order to simplify the XML
-  /// parsing task, the tokens passed to this function never include the leading
-  /// "<![CDATA[" characters, but always include the trailing "]]".
-  /// @param context The token context used to specify the CDATA block.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult Cdata(const XmlTokenContext& context);
-
-  /// This function is called to define a processing instruction. Processing
-  /// instructions have an XML syntax "<?...?>". In order to simplify the XML
-  /// parsing task, no parsing of the processing instruction is done: handlers
-  /// that need the contents parsed are on their own. Also, again to simplify
-  /// the XML parsing task, the tokens passed to this function never include the
-  /// leading "<?" characters, but always include the trailing "?>".
-  /// @param context The token context used to specify the processing data.
-  /// @return The match result from the context, or one that is modified to
-  /// contain an error message if needed.
-  virtual DataMatchResult Pi(const XmlTokenContext& context);
-};
-
-}  // namespace image_io
-}  // namespace photos_editing_formats
-
-#endif // IMAGE_IO_XML_XML_HANDLER_H_  // NOLINT