2.1.190 Part 4 Section, customXml (Block-Level Custom XML Element)

For additional notes that apply to this portion of the standard, please see the notes for oMath, §; oMathPara, §

a.   The standard states that the element attribute can contain any string value.

Word only allows values conforming to the XML specification: a string conforming to the definition of xsd:NCName with a length of at most 255 characters.

b.   The standard allows any string for the uri attribute.

Word will not open a file if the uri attribute is not declared in an accompanying attachedSchema element.