/**
  * Constructor
  */
 function OpenUrlNlmCitationSchemaCrosswalkFilter()
 {
     // We transform all types of OpenURL schema to NLM citation
     parent::OpenUrlCrosswalkFilter('OpenUrlBaseSchema', 'NlmCitationSchema');
 }
 /**
  * Constructor
  */
 function NlmCitationSchemaOpenUrlCrosswalkFilter()
 {
     // We transform NLM citation to all types of OpenURL schema
     parent::OpenUrlCrosswalkFilter('NlmCitationSchema', 'OpenUrlBaseSchema');
 }
 /**
  * Constructor
  */
 function OpenUrlNlmCitationSchemaCrosswalkFilter()
 {
     $this->setDisplayName('Crosswalk from Open URL to NLM Citation');
     parent::OpenUrlCrosswalkFilter();
 }
 /**
  * Constructor
  */
 function NlmCitationSchemaOpenUrlCrosswalkFilter()
 {
     $this->setDisplayName('Crosswalk from NLM Citation to Open URL');
     parent::OpenUrlCrosswalkFilter();
 }