[Sip] Bug in RFC 4826: resource-lists schema doesn't require anchor attribute

[Byron Campen]

The resource-lists schema in RFC 4826 does not match the normative text wrt whether the "anchor" attribute is required in <external> elements.

The normative text reads:

"
   The <external> element has a single
   mandatory attribute, "anchor", which specifies the external list by
   means of an absolute HTTP URI.
"

The schema reads:

"
    <xs:complexType name="externalType">
     <xs:sequence>
      <xs:element name="display-name" type="display-nameType"
       minOccurs="0"/>
      <xs:any namespace="##other" processContents="lax" minOccurs="0"
       maxOccurs="unbounded"/>
     </xs:sequence>
     <xs:attribute name="anchor" type="xs:anyURI"/>
     <xs:anyAttribute namespace="##other" processContents="lax"/>
    </xs:complexType>
"

        Should I go ahead and file an erratum?

Best regards,
Byron Campen

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