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(196265) 21st ecumenical council of the Roman Catholic church, announced by Pope John XXIII .
It has come to symbolize the church's readiness to acknowledge the circumstances of the modern world. Among the most notable of the 16 documents enacted were the "Dogmatic Constitution on the Church," which treats church hierarchy and provides for greater involvement of laypeople in the church; the "Dogmatic Constitution of Divine Revelation," which maintains an open attitude toward scholarly study of the Bible ; the "Constitution on the Sacred Liturgy," which provides for the use of vernacular languages in the mass in place of Latin; and the "Pastoral Constitution on the Church in the World of Today," which acknowledges the profound changes humanity has experienced in the modern world and attempts to relate the church to contemporary culture. Observers from other Christian churches were invited to the council in a gesture of ecumenism .