XML Schema 1.1 not supported

[dlastov]

I get following error report when I try to open the schema below:

Unknown node (8, 21): vc:minVersion
Unknown attribute (8, 21): vc:minVersion
Unknown node (24, 4): xs:alternative
Unknown element (24, 4): xs:alternative
Unknown node (25, 4): xs:alternative
Unknown element (25, 4): xs:alternative

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="test"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	targetNamespace="test"
	elementFormDefault="qualified"
	attributeFormDefault="unqualified"
	xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
	vc:minVersion="1.1"
	>
	<xs:complexType name="myType_v1">
		<xs:sequence>
			<xs:element name="description" type="xs:string"/>
		</xs:sequence>
		<xs:attribute name="version" type="xs:integer" use="required" fixed="1"/>
	</xs:complexType>
	<xs:complexType name="myType_v2">
		<xs:sequence>
			<xs:element name="new_description" type="xs:string"/>
		</xs:sequence>
		<xs:attribute name="version" type="xs:integer" use="required" fixed="2"/>
	</xs:complexType>
	<xs:element name="root">
		<xs:alternative test="@version=1" type="myType_v1"/>
		<xs:alternative test="@version=2" type="myType_v2"/>
	</xs:element>
</xs:schema>