Allow for overriding the child node names (needed for DataValidation and others)
Allow for overriding the child node names (needed for DataValidation and others)

ThijsWouters/rubyXL,ryanmark/rubyXL,ryanmark/rubyXL,mezza/rubyXL,mezza/rubyXL,ThijsWouters/rubyXL,parallel588/rubyXL,weshatheleopard/rubyXL,ryanmark/rubyXL,weshatheleopard/rubyXL,99cm/rubyXL,weshatheleopard/rubyXL,parallel588/rubyXL,99cm/rubyXL,parallel588/rubyXL,mezza/rubyXL,99cm/rubyXL