The URI is in the mddl.org domain; mddl.org is the organization that maintains the Market Data Definition Language, an XML vocabulary in which custodian is one of many elements.
URI 在 mddl.org 域中；mddl.org 是维护市场数据定义语言（Market Data Definition Language）这一 XML 词汇表的组织， custodian 是该词汇表中众多元素中的一个。
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