changed @type="conductingEngagement" into (active/passive) "performance"
new RNG schemas
Merge branch 'master' into rename_conductingEngagement
Merge branch 'master' into rename_conductingEngagement
merging part 2: updating schemas
adjusted description in constraint to @type="correspondence"
new schema for diaries
deleted superfluous data
Merge pull request #16 from Edirom/rename_conductingEngagement

Rename conducting engagement; closes #3