bool IgnoreMissingMandatoryElements
 PropertyDescription 
  Property NameIgnoreMissingMandatoryElements  
  Property Type bool  
  Accessors Read/Write  
  DescriptionCauses the parser to ignore mandatory elements that are missing in the XML document.  
  Remarks

This is mutually exclusive with IgnoreUnknwonElements (you can either ignore what’s missing or what’s extra but not both).