Apostrophes in image macro parameters value do not survive a backup restore

If an image from a different page is displayed in a page, and the page where the image is attached contains an apostrophe in the page title, upon taking a XML backup and restoring it, the image macro will display a Unknown Attachment error.

This is caused because the apostrophe in the page title in the macro parameters has changed to:

’

Repro steps:

1. Create a personal space.
2. Default home page is created with the title: User Name’s Home
3. Attach an image to the home page.
4. Create a new page in another space.
5. In the new page, insert the image from User Name’s Home. The generated XHTML is:

   <ri:attachment ri:filename="filename.png"><ri:page ri:content-title="User Name's Home" ri:space-key="~username" /></ri:attachment></ac:image>

6. Take a XML backup
7. Restore the XML backup
8. Go to the page created in step #4. Unknown Attachment is displayed instead of the image. The cause is that the apostrophe in the page name in the image macro parameter has been change to ’ and the page cannot be found. The XHTML for the page is:

   <ri:attachment ri:filename="filename.png"><ri:page ri:content-title="User Name&rsquo;s Home" ri:space-key="~username" /></ri:attachment></ac:image>

This could also affect other macros and other characters which are reserved XML characters.