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At ingest in the public TextGrid Repository (see step 2 Figure 5), each object is assigned a persistent identifier (PID), currently an EPIC2 Handle. In addition to the URL, the PID record also contains the internal object ID (the TextGrid URI, created by the NOID), the filesize and the checksum of the object. An example PID record (21.11113/0000-0009-4640-0) is depicted in the following figure:

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Fig. 7: PID record of an TextGrid object

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Besides the monitoring of the basic technical infrastructure by the GWDG, all the above listed components are individually monitored by developers and maintainers of SUB and GWDG as responsible institutions of the Humanities Data Centre, where the TextGrid Repository is located. The most important components and their dependencies are visualised in the following figure:



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Fig. 8: A dependency chart of the TextGrid architecture and involved services

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