... who maintains of list of XML ...

first "of" NOW READS "a"

The "dead" in the following sentence HAS BEEN CHANGED to constant width font (code) instead of italic font:
"The dead element is optional- it may occur zero times."

On the last sentence of the paragraph, the word "other" NOW READS "others":
"some datatypes have a full order relation ..., others have no order relation at all ..."

"There is one constraint added to its value space is that there ...."

NOW READS:
"The one constraint added to its value space is that there ...."

"though" HAS BEEN CHANGED to "through".

"it's a good idea to avoid using these constrains on these datatypes."

NOW READS:
"it's a good idea to avoid using these constraints on these datatypes."

A simple type was previously defined "integerOrData". The name of this simple type
NOW READS "integerOrDate".

"This is just the simplest form to specify piece."

NOW READS:
"This is just the simplest form to specify a piece."

"<xs:pattern value="b[0-9]{9}[0-9X]"/>"

NOW READS:
"<xs:pattern value="b[0-9]{9}[0-9X]"/>".

"<xs:pattern value="bd[0-9]{9}[0-9X]"/>"

NOW READS:
"<xs:pattern value="b[0-9]{9}[0-9X]"/>".

"Let's go back on the definition of the content models ...":

NOW READS:
"Let's go back over the definition of the content models ...."

"..., in practice, when the Constant Declaration Rule is violated, ...",

"Consistent" NOW READS "Constant".

"there is no special reason to impose the definition the title of a book after its ISBN ..."

NOW READS:
"there is no special reason to impose the definition of the title of a book after its ISBN ..."

"This is probably what we would like to see..."

NOW READS:
"This is probably not what we would like to see..."

On line 2, a missing period HAS BEEN ADDED between "complex content model" and "The resulting type".

"The location where the content of the base type is added may be chosen
during the extension of a complex content complex type..."

NOW READS:
"The location where the content of the base type is added may not be chosen
during the extension of a complex content complex type..."

At the end of line 3, "these kind of structures" NOW READS "these kinds of structures"

"full schemas documents can be"

NOW READS:
"full schema documents can be"

the "element defined under the same element or under one of *their* ancestors"
should be:
"element defined under the same element or under one of its ancestors."
^^^

The tags "full name" and "simple name" NOW READ "full-name", "simple-name".

on the second line, "each of this style" NOW READS "each of these styles".

"defining extension of the complex types ..."

NOW READS:
"defining extensions of the complex types ..."