Subversion working copies are sometimes accessed using several different clients, e.g. TortoiseSVN, AnkhSVN, and the svn command line client. Because the working copy format has changed with this release, 1.8 clients cannot access an earlier working copy without first upgrading it. Pre-1.8 clients cannot access 1.8 working copies at all and there is no downgrade option.
Migrating to 1.8 working copies must be considered a one-way operation. If you need to use multiple clients on the same working copy then be sure that you can update all the clients before upgrading the working copy.
迁移到1.8的工作副本必须被理解为一个单向操作。 如果你需要在同一个工作副本使用多个客户端,必须确认在更新工作副本前更新所有的客户端。
Older clients and servers interoperate transparently with 1.8 servers and clients. That is to say, you can use a 1.8 client with an older server, and you can use a 1.8 server with older clients. However, some of the new 1.8 features may not be available unless both client and server are the latest version. There are also cases where a new feature will work but will run less efficiently if the client is new and the server old.
source:http://tortoisesvn.net/tsvn_1.8_releasenotes.html
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