protected SamlIdPMetadataDocument newSamlIdPMetadataDocument() {
        return new SamlIdPMetadataDocument();
    }
New saml id p metadata document.

@return the saml id p metadata document
support/cas-server-support-saml-idp-core/src/main/java/org/apereo/cas/support/saml/idp/metadata/generator/BaseSamlIdPMetadataGenerator.java