Please describe the problem:
With the the xml file (xmllint.xml)
==================8<=================================================

<?xml version="1.0" encoding="utf8"?>
<pet>
        <animal name="dog" type="dangerous"/>
</pet>

==================8<=================================================
and its xsd schema (xmllint.xsd)
==================8<=================================================
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" >

        <xs:element name="pet">
                <xs:complexType>
                        <xs:choice>
                                <xs:element name="animal" type="cat"/>
                                <xs:element name="animal" type="dog"/>
                                <xs:element name="animal" type="hamster"/>
                                <xs:element name="animal" type="lion"/>
                        </xs:choice>
                </xs:complexType>
        </xs:element>

        <xs:complexType name="cat">
                <xs:attribute name="name" use="required" fixed="cat"/>
                <xs:attribute name="type" use="optional" default="friendly"/>
        </xs:complexType>

        <xs:complexType name="hamster">
                <xs:attribute name="name"  use="required" fixed="hamster"/>
                <xs:attribute name="type"  use="optional" default="friendly"/>
        </xs:complexType>

        <xs:complexType name="dog">
                <xs:attribute name="name" use="required" fixed="dog"/>
                <xs:attribute name="type"  use="optional" default="friendly"/>
        </xs:complexType>

        <xs:complexType name="lion">
                <xs:attribute name="name" use="required" fixed="lion"/>
                <xs:attribute name="type"   use="optional"
default="dangerous"/>
        </xs:complexType>

</xs:schema>
==================8<=================================================
xmllint validation (2.6.17) failed and produces:
on line 3 element animal: Element 'animal', attribute 'name': The value 'dog'
does not match the fixed value constraint 'lion'.

but if we choose lion, it works. 

This simple example reveals that only the last pet in the choice is checked.


Steps to reproduce:
To prove this again, if we change fixed="lion" to default="lion" (forcing to
switch use to "optional") it works..and the funny part is...it works whatever
you put in name of pet of the xml file..dangerous validation huh?

Actual results:


Expected results:
I expect that :
1) it validates all the pets given (ie whose name is dog,cat,hamster or lion) not only lion. 
2) in case I provide lion with name as default attribute (dangerous workaround), the other fixed values are checked (not ignored)
3) Each fixed attribute value on each element in choice that does not validates should do not produce warnings if one of the other element in the choice validates.

Does this happen every time?


Other information: