The W3C Voice Browser, Web APIs, and Web Application Formats (WAF) Working Groups have posted a new draft of Enabling Read Access for Web Resources (formerly Authorizing Read Access to XML Content Using the <?access-control?> Processing Instruction 1.0). According to the draft,
This document defines a mechanism to selectively provide cross-site access to a web resource. Using either a HTTP header or an XML processing instruction (or both), resources can indicate they allow read access from specified hosts (optionally using patterns). When a pattern is used, one can also exclude certain hosts. For instance, allow read access from all subdomains of example.org (*.example.org) with the exception of public.example.org (public.example.org).
The use of an HTTP header (in addition to processing instructions) is new in this draft.
