# RELAX NG Compact Syntax Grammar
# Description: Blogger: feed of a blog's posts

namespace app = "http://www.w3.org/2007/app"
namespace atom = "http://www.w3.org/2005/Atom"
namespace gd = "http://schemas.google.com/g/2005"
namespace media = "http://search.yahoo.com/mrss/"
namespace openSearch = "http://a9.com/-/spec/opensearch/1.1/"
namespace thr = "http://purl.org/syndication/thread/1.0"

start = blogger_blogPostFeed | blogger_postEntry


# Describes an author

atom_author = element atom:author { attribute xml:lang { xsd:string }?, (
    atom_email? &
    atom_name &
    atom_uri? ) }


# Describes a feed of a blog's posts

blogger_blogPostFeed = element atom:feed { attribute gd:etag { xsd:string }?, (
    atom_author+ &
    atom_generator &
    atom_id &
    atom_updated &
    blogger_bloggerLink+ &
    blogger_postEntry* &
    element atom:subtitle { atom_textConstruct }? &
    element atom:title { atom_textConstruct } &
    opensearch_itemsPerPage &
    opensearch_startIndex &
    opensearch_totalResults ) }


# Extends the base Link class with Blogger extensions

blogger_bloggerLink = element atom:link {
    attribute href { xsd:string },
    attribute length { xsd:long }?,
    attribute rel { "alternate" | "edit" | "enclosure" |
    "http://schemas.google.com/blogger/2008#settings" |
    "http://schemas.google.com/blogger/2008#template" |
    "http://schemas.google.com/g/2005#feed" |
    "http://schemas.google.com/g/2005#post" | "next" | "previous" | "replies" |
    "self" },
    attribute title { xsd:string }?,
    attribute type { xsd:string } }


# Describes a category

atom_category = element atom:category {
    attribute label { xsd:string }?,
    attribute scheme { xsd:string }?,
    attribute term { xsd:string },
    attribute xml:lang { xsd:string }? }


# Describes a content

atom_content = element atom:content {
    attribute src { xsd:string }?,
    attribute type { xsd:string }?,
    attribute xml:lang { xsd:string }?,
    xsd:string? }


# Describes an Atom publication control status

app_control = element app:control { app_draft }


# Value of the app:draft tag

app_draft = element app:draft { xsd:string }


# Value of the app:edited tag

app_edited = element app:edited { (xsd:date | xsd:dateTime) }


# Describes an author's email address

atom_email = element atom:email { xsd:string }


# Describes the generator

atom_generator = element atom:generator {
    attribute uri { xsd:string }?,
    attribute version { xsd:string }?,
    xsd:string }


# Describes a unique identifier

atom_id = element atom:id { xsd:string }


# Describes the number of items that will be returned per page for paged feeds

opensearch_itemsPerPage = element openSearch:itemsPerPage { xsd:int }


# Describes a media thumbnail

mediarss_mediaThumbnail = element media:thumbnail {
    attribute height { xsd:unsignedInt }?,
    attribute time { xsd:string }?,
    attribute url { xsd:string },
    attribute width { xsd:unsignedInt }? }


# Describes an author's human-readable name

atom_name = element atom:name { xsd:string }


# Describes a blog post entry

blogger_postEntry = element atom:entry { attribute gd:etag { xsd:string }?, (
    app_control? &
    app_edited? &
    atom_author+ &
    atom_category* &
    atom_content &
    atom_id &
    atom_published &
    atom_updated &
    blogger_bloggerLink+ &
    element atom:title { atom_textConstruct } &
    mediarss_mediaThumbnail? &
    threading_total? ) }


# Describes a creation timestamp

atom_published = element atom:published { (xsd:date | xsd:dateTime) }


# Describes the starting index of the contained entries for paged feeds

opensearch_startIndex = element openSearch:startIndex { xsd:int }


# Describes a text construct containing either plain text, HTML, or XHTML

atom_textConstruct = attribute src { xsd:string }?,
    attribute type { xsd:string }?,
    attribute xml:lang { xsd:string }?,
    xsd:string?


# Indicates total number of unique responses to an entry

threading_total = element thr:total { xsd:unsignedInt }


# Describes the total number of results associated with this feed

opensearch_totalResults = element openSearch:totalResults { xsd:int }


# Describes a last updated timestamp

atom_updated = element atom:updated { (xsd:date | xsd:dateTime) }


# Describes the URI associated with an author

atom_uri = element atom:uri { xsd:string }