Elytron client, elytron-1_0.xsd, protection-parameter-credentials is incorrectly defined as client-credentials-type.

 <xsd:element name="credential-store-reference" type="credential-store-reference-type"/>

   <xsd:complexType name="client-credentials-type">
        <xsd:choice minOccurs="0" maxOccurs="unbounded">
            <xsd:element name="key-store-reference" type="key-store-ref-type"/>
            <xsd:element name="credential-store-reference" type="credential-store-reference-type"/>
            <xsd:element name="clear-password" type="clear-password-type"/>
            <xsd:element name="hashed-password" type="hashed-password-type"/>
            <xsd:element name="crypt-password" type="crypt-password-type"/>
            <xsd:element name="key-pair" type="key-pair-type"/>
            <xsd:element name="certificate" type="certificate-type"/>
            <xsd:element name="public-key-pem" type="xsd:string"/>
            <xsd:element name="bearer-token" type="bearer-token-type"/>
            <xsd:element name="oauth2-bearer-token" type="oauth2-bearer-token-type"/>
        </xsd:choice>
    </xsd:complexType>