Both 6.3.4 and 6.3.6.3 contain the following sentence:
If the language attribute is not present, the value of the element shall be treated as if the language attribute were en.
Prefer present tense:
If the language attribute is not present, the value of the element shall be treated as if the language attribute is en.
Both 6.3.4 and 6.3.6.3 contain the following sentence: If the language attribute is not present, the value of the element shall be treated as if the language attribute were
en
.Prefer present tense: If the language attribute is not present, the value of the element shall be treated as if the language attribute is
en
.