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TagNames Parameter

By default, the Historian REST service provides support to read samples for multiple tags. Multiple tag names are separated by semicolons (;). For example, "tagname1;tagname2;tagname3".

https://<historianservername>:8443/historian-rest-api
/v1/datapoints/currentvalue?tagNames=tagName1;tagname2;tagname3

Encode the semicolon as %3B if using the URI format, as the semicolon is also a valid character for a Historian name, and the web service parses the tag names incorrectly if a tag name contains a semicolon.