pe-ro

Modify description of reason attribute

2

TEI uses a NCNAME as the datatype for `@reason`. But changing the datatype for MEI may break backward compatibility in some cases. To encourage more TEI-like values in the `@reason`...

To be more in line with TEI, the values allowed by `att.regularMethod/@method` should be "silent" and "markup". Typically, correction that isn't carried out silently is accomplished by using elements, but...

As indirectly suggested by @craigsapp in https://github.com/music-encoding/sample-encodings/issues/9.