Most of these are defined as empty marker elements, with extension attributes from other namespaces allowed but no content.

它们中的大多数都被定义为空的标记元素，包含了其他名称空间支持的扩展属性，但不包含内容。

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The paper introduced the pickup technique of seismic attributes based on referential marker horizon and described in detail the pickup method of horizon attributes.

本文介绍了基于参考标准层的地震属性提取技术，并细致描述了沿层属性的提取方法。

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