Period - Collection (SDMX: CL_TIME_PER_COLLECT)

This classification provides a list of values to represent dates or periods during which observations have been collected in order to calculate the indicator for the target reference period. This classification was formally adopted on 15 April 2015. For more information about this classification and SDMX classifications in general (e.g. list of generic codes to express general concepts such as "Total", "Unknown", etc.; syntax for the creation of codes, general guide for the creation of SDMX classifications), you can consult this [link](https://sdmx.org/?page_id=4345).

本分类提供一组数值，用以表征为计算目标参考周期内的指标而采集观测数据的日期或时段。该分类于2015年4月15日正式通过。如需获取本分类及通用统计数据与元数据交换（SDMX）分类体系的更多相关信息，包括用于表达"总计""未知"等通用概念的通用代码列表、代码生成语法、SDMX分类体系构建通用指南，您可查阅此[链接](https://sdmx.org/?page_id=4345)。