The date of the change is often documented (called meta data: data about data), but not always.

Because you are never sure that your meta data (station history) is complete, statistical homogenization should always be applied as well.

Is it meta data in the requests, if so that can be spoofed.

They are used to indicate meta data and to mark sections of a song.

What "fancy meta data" are the rest of us supposed to be missing exactly?

The client agent splits the data and meta data for the file being requested.

Using attributes - meta data is embedded in class definitions in the source code.

Each different filesystem provides the host operating system with meta data so that it knows how to read and write data.

There may also be specific meta data attached to a construct.

By gathering appropriate meta data, the value of each individual data point can be greatly expanded.