5.4.1 Rule Binding
from: provide a mechanism to support     binding of 
to  : provide a mechanism to support the binding of 

5.4.1 Rule Binding
"to a set of documents in a model".  I think we intended to allow binding to any document in the model, i.e. not just instance documents, but we are not actually specifying this clearly.

6. Localization of natural-language messages, item 3
from: where     containing element has textual content
to  : where the containing element has textual content

6. Localization of natural-language messages, note
from: used to identify the resource containing the test and
to  : used to identify the resource containing the text and
                                                     -
6. Localization of natural-language messages, note
from: concrete sample on how the
to  : concrete sample of how the
                       -
(also occurs in 6.1 variable substitution)

6.1 Variable substitution, awkward text
"Although this specification does not mandate how substitution variable is used in Schematron messages, it suggests the use of xsl:variable to achieve this support."
Perhaps:
Although this specification does not mandate the use of variable substitution in Schematron messages, it suggests the use of xsl:variable when variable substitution is desired.

The text of the titles in both 6. and 6.1 is capitalized inconsistently with the rest of the document.  

I also note that 6.1 variable substitution is a sub-section of 6. localization, although its use is orthogonal at least in the context of Schematron messages, the only place both are allowed.  If they are orthogonal, they should be at the same numbering level.