return the singleton instance of the keywordregistry . concode_field_sep String TAG_KEYWORD concode_elem_sep String ATT_ID concode_elem_sep String ATT_LABEL concode_elem_sep KeywordRegistry instance concode_elem_sep Map internalKeywordMap concode_field_sep void removeExtension concode_elem_sep void addExtension concode_elem_sep String getKeywordLabel concode_elem_sep IExtensionPoint getExtensionPointFilter
KeywordRegistry function ( ) { if ( instance == null ) { instance = new KeywordRegistry ( ) ; } return instance ; }