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See [Namespaces in XML 1.0 (Third Edition)][1]:
> The prefix xml is by definition bound to the namespace name
> http://www.w3.org/XML/1998/namespace. It MAY, but need not, be
> declared, and MUST NOT be bound to any other namespace name. Other
> prefixes MUST NOT be bound to this namespace name, and it MUST NOT be
> declared as the default namespace.
>
> The prefix xmlns is used only to declare namespace bindings and is by
> definition bound to the namespace name http://www.w3.org/2000/xmlns/.
> It MUST NOT be declared . Other prefixes MUST NOT be bound to this
> namespace name, and it MUST NOT be declared as the default namespace.
> Element names MUST NOT have the prefix xmlns.
>
> In XML documents conforming to this specification, no tag may containe
> two attributes which have identical names, or have qualified names
> with the same local part and with prefixes which have been bound to
> namespace names that are identical.
[1] http://www.w3.org/TR/REC-xml-names/
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Section 3.3.3 of the XML Recommendation gives the rules for
attribute-value normalization. One of those rules requires
that character references not be re-normalized after being
replaced with the referenced characters:
For a character reference, append the referenced
character to the normalized value.
And, in particular:
Note that if the unnormalized attribute value contains
a character reference to a white space character other
than space (#x20), the normalized value contains the
referenced character itself (#xD, #xA or #x9).
Source: http://www.w3.org/TR/xml/#AVNormalize
In xmerl_scan, however, character references in attributes are
normalized an extra time after replacement. For example, the
character reference "
" in the following XML document gets
normalized (incorrectly) into a space when parsed:
2> xmerl_scan:string("<root x='
'/>").
{... [{xmlAttribute,x,[],[],[],[],1,[]," ",false}] ...}
This short patch restores the correct behavior:
2> xmerl_scan:string("<root x='
'/>").
{... [{xmlAttribute,x,[],[],[],[],1,[],"\n",false}] ...}
NOTE: This change does not include tests because I could not
find a test suite for xmerl.
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