Exporting into IMSCC and importing IMSCC causes errors

If you create a course structure that the pages contain accents or "ñ", you cannot export and import using the IMS CC standard.

Steps to reproduce it:

1-Create some pages and subpages that contains accents or ñ (á é í ó ú or ñ)
2-Export into IMS CC
3-Delete Lesson Builder contents in that site
4-Import the same file using IMS CC

AFAIK, the error happens when process the imsmanifest.xml, log throws errors like this:

Caused by: org.jdom.input.JDOMParseException: Error on line 32: The entity "oacute" was referenced, but not declared.
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:468)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:770)
at org.sakaiproject.lessonbuildertool.cc.AbstractParser.getXML(AbstractParser.java:133)
... 86 more
Caused by: org.xml.sax.SAXParseException; lineNumber: 32; columnNumber: 34; The entity "oacute" was referenced, but not declared.

If you remove the accents and ñ from the imsmanifest.xml works perfectly, only fails processing this kind of entities.

Should we use xml codes instead of html entities?

Example: Instead of é use é