diff --git a/schemas/csl-categories.rnc b/schemas/csl-categories.rnc
new file mode 100644
index 0000000..4e44b5c
--- /dev/null
+++ b/schemas/csl-categories.rnc
@@ -0,0 +1,38 @@
+namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
+
+
+## Categories for style metadata
+div {
+  category.citation-format =
+    "author" | "author-date" | "label" | "note" | "numeric"
+  
+  ## Use "generic-base" for styles that are non-discipline specific, such as
+  ## APA, Harvard, etc.
+  category.field =
+    "anthropology"
+    | "astronomy"
+    | "biology"
+    | "botany"
+    | "chemistry"
+    | "communications"
+    | "engineering"
+    | "generic-base"
+    | "geography"
+    | "geology"
+    | "history"
+    | "humanities"
+    | "law"
+    | "linguistics"
+    | "literature"
+    | "math"
+    | "medicine"
+    | "philosophy"
+    | "physics"
+    | "political_science"
+    | "psychology"
+    | "science"
+    | "social_science"
+    | "sociology"
+    | "theology"
+    | "zoology"
+}
diff --git a/schemas/csl-choose.rnc b/schemas/csl-choose.rnc
new file mode 100644
index 0000000..f9310b2
--- /dev/null
+++ b/schemas/csl-choose.rnc
@@ -0,0 +1,76 @@
+namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
+namespace cs = "http://purl.org/net/xbiblio/csl"
+
+
+## cs:choose - Conditional Statements"
+div {
+  rendering-element.choose =
+    
+    ## Use to conditionally render rendering elements.
+    element cs:choose { choose.if, choose.else-if*, choose.else? }
+  choose.if = element cs:if { condition+, match, rendering-element* }
+  choose.else-if =
+    element cs:else-if { condition+, match, rendering-element* }
+  choose.else = element cs:else { rendering-element+ }
+  condition =
+    
+    ## If used, the element content is only rendered if it disambiguates two
+    ## otherwise identical citations. This attempt at disambiguation is only
+    ## made after all other disambiguation methods have failed.
+    [ a:defaultValue = "true" ] attribute disambiguate { "true" }
+    | 
+      ## Tests whether the given variables contain numeric text.
+      attribute is-numeric {
+        list { variables+ }
+      }
+    | 
+      ## Tests whether the given date variables contain approximate dates.
+      attribute is-uncertain-date {
+        list { variables.dates+ }
+      }
+    | 
+      ## Tests whether the locator matches the given locator types.
+      attribute locator {
+        list { terms.locator+ }
+      }
+    | 
+      ## Tests whether the cite position matches the given positions.
+      attribute position {
+        list {
+          ("first"
+           | "subsequent"
+           | "ibid"
+           | "ibid-with-locator"
+           | "near-note")+
+        }
+      }
+    | 
+      ## Tests whether the item matches the given types.
+      attribute type {
+        list { item-types+ }
+      }
+    | 
+      ## Tests whether the default ("long") forms of the given variables
+      ## contain non-empty values.
+      attribute variable {
+        list { variables+ }
+      }
+  match =
+    
+    ## Set the testing logic.
+    [ a:defaultValue = "all" ]
+    attribute match {
+      
+      ## Element only tests "true" when all conditions test "true" for all
+      ## given test values.
+      "all"
+      | 
+        ## Element tests "true" when any condition tests "true" for any given
+        ## test value.
+        "any"
+      | 
+        ## Element only tests "true" when none of the conditions test "true"
+        ## for any given test value.
+        "none"
+    }?
+}
diff --git a/schemas/csl-terms.rnc b/schemas/csl-terms.rnc
new file mode 100644
index 0000000..93f3fc5
--- /dev/null
+++ b/schemas/csl-terms.rnc
@@ -0,0 +1,175 @@
+namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
+
+
+## Terms
+div {
+  terms =
+    terms.gender-assignable
+    | terms.gender-variants
+    | terms.locator
+    | item-types
+    | 
+      ## Contributor roles
+      variables.names
+    | "editortranslator"
+    | 
+      ## Miscellaneous terms
+      "accessed"
+    | "ad"
+    | "advance-online-publication"
+    | "album"
+    | "and"
+    | "and others"
+    | "anonymous"
+    | "at"
+    | "audio-recording"
+    | "available at"
+    | "bc"
+    | "bce"
+    | "by"
+    | "ce"
+    | "circa"
+    | "cited"
+    | "et-al"
+    | "film"
+    | "forthcoming"
+    | "from"
+    | "henceforth"
+    | "ibid"
+    | "in"
+    | "in press"
+    | "internet"
+    | "interview"
+    | "letter"
+    | "loc-cit"
+    | "no date"
+    | "no-place"
+    | "no-publisher"
+    | "on"
+    | "online"
+    | "op-cit"
+    | "original-work-published"
+    | "personal-communication"
+    | "podcast"
+    | "podcast-episode"
+    | "preprint"
+    | "presented at"
+    | "radio-broadcast"
+    | "radio-series"
+    | "radio-series-episode"
+    | "reference"
+    | "retrieved"
+    | "review-of"
+    | "scale"
+    | "special-issue"
+    | "special-section"
+    | "television-broadcast"
+    | "television-series"
+    | "television-series-episode"
+    | "video"
+    | "working-paper"
+    | 
+      ## Punctuation
+      "open-quote"
+    | "close-quote"
+    | "open-inner-quote"
+    | "close-inner-quote"
+    | "page-range-delimiter"
+    | "colon"
+    | "comma"
+    | "semicolon"
+    | 
+      ## Seasons
+      "season-01"
+    | "season-02"
+    | "season-03"
+    | "season-04"
+  
+  ## Terms to which a gender may be assigned
+  terms.gender-assignable =
+    
+    ## Months
+    "month-01"
+    | "month-02"
+    | "month-03"
+    | "month-04"
+    | "month-05"
+    | "month-06"
+    | "month-07"
+    | "month-08"
+    | "month-09"
+    | "month-10"
+    | "month-11"
+    | "month-12"
+    | terms.non-locator-number-variables
+    | terms.locator-number-variables
+  
+  ## Terms for which gender variants may be specified
+  terms.gender-variants = terms.ordinals | terms.long-ordinals
+  terms.ordinals =
+    
+    ## Ordinals
+    xsd:string { pattern = "ordinal(-\d{2})?" }
+  terms.long-ordinals =
+    
+    ## Long ordinals
+    "long-ordinal-01"
+    | "long-ordinal-02"
+    | "long-ordinal-03"
+    | "long-ordinal-04"
+    | "long-ordinal-05"
+    | "long-ordinal-06"
+    | "long-ordinal-07"
+    | "long-ordinal-08"
+    | "long-ordinal-09"
+    | "long-ordinal-10"
+  
+  ## Locators
+  terms.locator =
+    "act"
+    | "appendix"
+    | "article-locator"
+    | "book"
+    | "canon"
+    | "chapter"
+    | "column"
+    | "elocation"
+    | "equation"
+    | "figure"
+    | "folio"
+    | "line"
+    | "note"
+    | "opus"
+    | "paragraph"
+    | "rule"
+    | "scene"
+    | "sub-verbo"
+    | "table"
+    | "timestamp"
+    | "title-locator"
+    | "verse"
+    | terms.locator-number-variables
+  
+  ## Locator terms with matching number variables
+  terms.locator-number-variables =
+    "issue"
+    | "page"
+    | "part"
+    | "section"
+    | "supplement"
+    | "version"
+    | "volume"
+  
+  ## Non-locator terms accompanying number variables
+  terms.non-locator-number-variables =
+    "chapter-number"
+    | "citation-number"
+    | "collection-number"
+    | "edition"
+    | "first-reference-note-number"
+    | "number"
+    | "number-of-pages"
+    | "number-of-volumes"
+    | "page-first"
+    | "printing"
+}
diff --git a/schemas/csl-types.rnc b/schemas/csl-types.rnc
new file mode 100644
index 0000000..539e040
--- /dev/null
+++ b/schemas/csl-types.rnc
@@ -0,0 +1,52 @@
+namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
+
+
+## Item types
+div {
+  item-types =
+    "article"
+    | "article-journal"
+    | "article-magazine"
+    | "article-newspaper"
+    | "bill"
+    | "book"
+    | "broadcast"
+    | "chapter"
+    | "classic"
+    | "collection"
+    | "dataset"
+    | "document"
+    | "entry"
+    | "entry-dictionary"
+    | "entry-encyclopedia"
+    | "event"
+    | "figure"
+    | "graphic"
+    | "hearing"
+    | "interview"
+    | "legal_case"
+    | "legislation"
+    | "manuscript"
+    | "map"
+    | "motion_picture"
+    | "musical_score"
+    | "pamphlet"
+    | "paper-conference"
+    | "patent"
+    | "performance"
+    | "periodical"
+    | "personal_communication"
+    | "post"
+    | "post-weblog"
+    | "regulation"
+    | "report"
+    | "review"
+    | "review-book"
+    | "software"
+    | "song"
+    | "speech"
+    | "standard"
+    | "thesis"
+    | "treaty"
+    | "webpage"
+}
diff --git a/schemas/csl-variables.rnc b/schemas/csl-variables.rnc
new file mode 100644
index 0000000..fe66d5e
--- /dev/null
+++ b/schemas/csl-variables.rnc
@@ -0,0 +1,128 @@
+namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
+
+
+## Variables
+div {
+  
+  ## All variables
+  variables = variables.dates | variables.names | variables.standard
+  
+  ## Standard variables
+  variables.standard =
+    variables.numbers | variables.strings | variables.titles
+  
+  ## Date variables
+  variables.dates =
+    "accessed"
+    | "available-date"
+    | "event-date"
+    | "issued"
+    | "original-date"
+    | "submitted"
+  
+  ## Name variables
+  variables.names =
+    "author"
+    | "chair"
+    | "collection-editor"
+    | "compiler"
+    | "composer"
+    | "container-author"
+    | "contributor"
+    | "curator"
+    | "director"
+    | "editor"
+    | "editor-translator"
+    | "editorial-director"
+    | "executive-producer"
+    | "guest"
+    | "host"
+    | "illustrator"
+    | "interviewer"
+    | "narrator"
+    | "organizer"
+    | "original-author"
+    | "performer"
+    | "producer"
+    | "recipient"
+    | "reviewed-author"
+    | "script-writer"
+    | "series-creator"
+    | "translator"
+  
+  ## Number variables
+  variables.numbers =
+    "chapter-number"
+    | "citation-number"
+    | "collection-number"
+    | "edition"
+    | "first-reference-note-number"
+    | "issue"
+    | "locator"
+    | "number"
+    | "number-of-pages"
+    | "number-of-volumes"
+    | "page"
+    | "page-first"
+    | "part-number"
+    | "printing-number"
+    | "section"
+    | "supplement-number"
+    | "version"
+    | "volume"
+  
+  ## Title variables
+  variables.titles =
+    "collection-title"
+    | "container-title"
+    | "original-title"
+    | "part-title"
+    | "reviewed-title"
+    | "title"
+    | "volume-title"
+    | # Short title forms. Will be removed in CSL 1.1
+      "title-short"
+    | "container-title-short"
+  
+  ## String variables
+  variables.strings =
+    "abstract"
+    | "annote"
+    | "archive"
+    | "archive_collection"
+    | "archive_location"
+    | "archive-place"
+    | "authority"
+    | "call-number"
+    | "citation-key"
+    | "citation-label"
+    | "dimensions"
+    | "division"
+    | "DOI"
+    | # Alias for 'event-title'. Deprecated. Will be removed in CSL 1.1.
+      "event"
+    | "event-title"
+    | "event-place"
+    | "genre"
+    | "ISBN"
+    | "ISSN"
+    | "jurisdiction"
+    | "keyword"
+    | "language"
+    | "license"
+    | "medium"
+    | "note"
+    | "original-publisher"
+    | "original-publisher-place"
+    | "PMCID"
+    | "PMID"
+    | "publisher"
+    | "publisher-place"
+    | "references"
+    | "reviewed-genre"
+    | "scale"
+    | "source"
+    | "status"
+    | "URL"
+    | "year-suffix"
+}
diff --git a/schemas/csl.rnc b/schemas/csl.rnc
new file mode 100644
index 0000000..c768055
--- /dev/null
+++ b/schemas/csl.rnc
@@ -0,0 +1,1017 @@
+namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
+namespace bibo = "http://purl.org/ontology/bibo/"
+namespace cs = "http://purl.org/net/xbiblio/csl"
+namespace dc = "http://purl.org/dc/elements/1.1/"
+namespace sch = "http://purl.oclc.org/dsdl/schematron"
+namespace xhtml = "http://www.w3.org/1999/xhtml"
+
+# CSL schema metadata
+
+dc:title [ "Citation Style Language" ]
+dc:creator [ "Bruce D'Arcus" ]
+dc:creator [ "Simon Kornblith" ]
+bibo:editor [ "Frank Bennett" ]
+bibo:editor [ "Rintze Zelle" ]
+dc:rights [
+  "Copyright 2007-2020 Citation Style Language and contributors"
+]
+dc:license [ "MIT license" ]
+dc:description [
+  "RELAX NG compact schema for the Citation Style Language (CSL)."
+]
+
+## Subparts of the CSL schema
+include "csl-choose.rnc"
+include "csl-terms.rnc"
+include "csl-types.rnc"
+include "csl-variables.rnc"
+include "csl-categories.rnc"
+# ==============================================================================
+
+## cs:style and cs:locale - Root Elements
+div {
+  start =
+    independent-style.style | dependent-style.style | locale-file.locale
+  independent-style.style =
+    element cs:style {
+      
+      ## Select whether citations appear in-text or as notes.
+      attribute class { "in-text" | "note" },
+      style.default-locale,
+      style.options,
+      version,
+      independent-style.style.info,
+      (style.locale*
+       & style.macro*
+       & style.citation
+       & style.bibliography?)
+    }
+  dependent-style.style =
+    element cs:style {
+      style.default-locale, version, dependent-style.style.info
+    }
+  style.default-locale =
+    
+    ## Set a default style locale.
+    attribute default-locale { xsd:language }?
+  version =
+    
+    ## Indicate CSL version compatibility.
+    [ a:defaultValue = "1.0" ] attribute version { "1.0" }
+}
+# ==============================================================================
+
+## cs:info - Style and Locale File Metadata
+div {
+  
+  ## Metadata for independent styles.
+  independent-style.style.info =
+    element cs:info {
+      info.author*
+      & info.category*
+      & info.contributor*
+      & info.id
+      & info.issn*
+      & info.eissn?
+      & info.issnl?
+      & independent-style.info.link*
+      & info.published?
+      & info.rights?
+      & info.summary?
+      & info.title
+      & info.title-short?
+      & info.updated
+    }
+  
+  ## Metadata for dependent styles.
+  dependent-style.style.info =
+    element cs:info {
+      info.author*
+      & info.category*
+      & info.contributor*
+      & info.id
+      & info.issn*
+      & info.eissn?
+      & info.issnl?
+      & dependent-style.info.link+
+      & info.published?
+      & info.rights?
+      & info.summary?
+      & info.title
+      & info.title-short?
+      & info.updated
+    }
+  
+  ## Metadata for locale files.
+  locale-file.locale.info =
+    element cs:info { info.translator* & info.rights? & info.updated? }
+  info.author = element cs:author { personal-details }
+  info.contributor = element cs:contributor { personal-details }
+  info.translator = element cs:translator { personal-details }
+  personal-details =
+    element cs:name { text }
+    & element cs:email { text }?
+    & element cs:uri { xsd:anyURI }?
+  info.category =
+    
+    ## Specify the citation format of the style (using the "citation-format"
+    ## attribute) or the fields and disciplines for which the style is
+    ## relevant (using the "field" attribute).
+    element cs:category {
+      attribute citation-format { category.citation-format }
+      | attribute field { category.field }
+    }
+  info.id =
+    
+    ## Specify the unique and stable identifier for the style. A URI
+    ## is valid, but new styles should use a UUID to ensure stability
+    ## and uniqueness.
+    element cs:id { xsd:anyURI }
+  info.issn =
+    
+    ## Specify the journal's ISSN(s) for journal-specific styles. An ISSN
+    ## must consist of four digits, a hyphen, three digits, and a check
+    ## digit (a numeral digit or roman X), e.g. "1234-1231".
+    element cs:issn { issn }
+  info.eissn =
+    
+    ## Specify the journal's eISSN for journal-specific styles.
+    element cs:eissn { issn }
+  info.issnl =
+    
+    ## Specify the journal's ISSN-L for journal-specific styles.
+    element cs:issnl { issn }
+  issn = xsd:string { pattern = "\d{4}\-\d{3}(\d|x|X)" }
+  independent-style.info.link =
+    element cs:link {
+      attribute href { xsd:anyURI },
+      
+      ## Specify how the URL relates to the style.
+      attribute rel {
+        
+        ## The URI of the CSL style itself.
+        "self"
+        | 
+          ## URI of the style from which the current style is derived.
+          "template"
+        | 
+          ## URI of style documentation.
+          "documentation"
+      },
+      info-text
+    }
+  dependent-style.info.link =
+    element cs:link {
+      attribute href { xsd:anyURI },
+      
+      ## Specify how the URL relates to the style.
+      attribute rel {
+        
+        ## The URI of the CSL style itself.
+        "self"
+        | 
+          ## URI of the CSL style whose content should be used for
+          ## processing. Required for dependent styles.
+          "independent-parent"
+        | 
+          ## URI of style documentation.
+          "documentation"
+      },
+      info-text
+    }
+  info.published =
+    
+    ## Specify when the style was initially created or made available.
+    element cs:published { xsd:dateTime }
+  info.rights =
+    element cs:rights {
+      attribute license { xsd:anyURI }?,
+      info-text
+    }
+  info.summary = element cs:summary { info-text }
+  info.title = element cs:title { info-text }
+  info.title-short =
+    
+    ## Specify an abbreviated style title (e.g., "APA")
+    element cs:title-short { info-text }
+  info.updated =
+    
+    ## Specify when the style was last updated (e.g.,
+    ## "2007-10-26T21:32:52+02:00")
+    element cs:updated { xsd:dateTime }
+  info-text =
+    attribute xml:lang { xsd:language }?,
+    text
+}
+# ==============================================================================
+
+## cs:locale in Independent Styles
+div {
+  style.locale =
+    
+    ## Use to (re)define localized terms, dates and options.
+    element cs:locale {
+      
+      ## Specify the affected locale(s). If "xml:lang" is not set, the
+      ## "cs:locale" element affects all locales.
+      attribute xml:lang { xsd:language }?,
+      (locale.style-options? & locale.date* & locale.terms?)
+    }
+}
+# ==============================================================================
+
+## cs:locale Contents - Localization Data
+div {
+  
+  ## Localized global options are specified as attributes in the
+  ## cs:style-options element. If future versions of CSL include localized
+  ## options that are citation or bibliography specific, the elements
+  ## cs:citation-options and cs:bibliography-options can be added.
+  locale.style-options =
+    element cs:style-options {
+      
+      ## Limit the "ordinal" form to the first day of the month.
+      [ a:defaultValue = "false" ]
+      attribute limit-day-ordinals-to-day-1 { xsd:boolean }?,
+      
+      ## Specify whether punctuation (a period or comma) is placed within
+      ## or outside (default) the closing quotation mark.
+      [ a:defaultValue = "false" ]
+      attribute punctuation-in-quote { xsd:boolean }?
+    }
+  locale-file.locale =
+    element cs:locale {
+      
+      ## Specify the locale of the locale file.
+      attribute xml:lang { xsd:language },
+      version,
+      locale-file.locale.info?,
+      (locale.style-options & locale.date+ & locale.terms)
+    }
+  locale.date =
+    element cs:date {
+      date.form,
+      delimiter,
+      font-formatting,
+      text-case,
+      locale.date.date-part+
+    }
+  date.form =
+    
+    ## Select the localized date format ("text" or "numeric").
+    attribute form {
+      
+      ## Text date form (e.g., "December 15, 2005").
+      "text"
+      | 
+        ## Numeric date form (e.g., "2005-12-15").
+        "numeric"
+    }
+  locale.date.date-part =
+    element cs:date-part {
+      affixes, font-formatting, text-case, (day | month | year)
+    }
+  locale.terms = element cs:terms { terms.term+ }
+  
+  ## The "cs:term" element can either hold a basic string, or "cs:single" and
+  ## "cs:multiple" child elements to give singular and plural forms of the term.
+  terms.term =
+    element cs:term {
+      term.attributes,
+      (text | (term.single, term.multiple))
+    }
+  term.attributes =
+    (attribute name { terms },
+     [ a:defaultValue = "long" ] attribute form { term.form }?)
+    | (attribute name { terms.ordinals },
+       attribute form { "long" }?,
+       attribute gender-form { "masculine" | "feminine" }?,
+       attribute match {
+         "last-digit" | "last-two-digits" | "whole-number"
+       }?)
+    | (attribute name { terms.long-ordinals },
+       attribute form { "long" }?,
+       attribute gender-form { "masculine" | "feminine" })
+    | (attribute name { terms.gender-assignable },
+       attribute form { "long" }?,
+       attribute gender { "masculine" | "feminine" })
+  
+  ## "verb-short" reverts to "verb" if the "verb-short" form is not available.
+  ## "symbol" reverts to "short" if the "symbol" form is not available.
+  ## "verb" and "short" revert to "long" if the specified form is not available.
+  term.form = "long" | "verb" | "short" | "verb-short" | "symbol"
+  term.single =
+    
+    ## Singular version of the term.
+    element cs:single { text }
+  term.multiple =
+    
+    ## Plural version of the term.
+    element cs:multiple { text }
+}
+# ==============================================================================
+
+## cs:macro
+div {
+  style.macro =
+    
+    ## Use to create collections of (reusable) formatting instructions.
+    element cs:macro {
+      attribute name { xsd:NMTOKEN },
+      rendering-element+
+    }
+}
+# ==============================================================================
+
+## Rendering Elements
+div {
+  rendering-element =
+    rendering-element.names
+    | rendering-element.date
+    | rendering-element.label
+    | rendering-element.text
+    | rendering-element.number
+    | rendering-element.choose
+    | rendering-element.group
+}
+# ==============================================================================
+
+## cs:citation and cs:bibliography
+div {
+  style.citation =
+    
+    ## Use to describe the formatting of citations.
+    element cs:citation { citation.options, sort?, citation.layout }
+  style.bibliography =
+    
+    ## Use to describe the formatting of the bibliography.
+    element cs:bibliography {
+      bibliography.options, sort?, bibliography.layout
+    }
+  citation.layout =
+    element cs:layout {
+      affixes, delimiter, font-formatting, rendering-element+
+    }
+  bibliography.layout =
+    element cs:layout { affixes, font-formatting, rendering-element+ }
+}
+# ==============================================================================
+
+## cs:names Rendering Element
+div {
+  rendering-element.names =
+    element cs:names {
+      names.attributes,
+      ((names.name?, names.et-al?) & names.label?),
+      names.substitute?
+    }
+  names.attributes =
+    attribute variable {
+      list { variables.names+ }
+    },
+    affixes,
+    
+    ## Specify the delimiter for name lists of name variables rendered by
+    ## the same cs:names element.
+    delimiter,
+    display,
+    font-formatting
+  names.name =
+    element cs:name {
+      name.attributes,
+      
+      ## Select the "long" (first name + last name, for Western names),
+      ## "short" (last name only, for Western names), or "count" name form
+      ## (returning the number of names in the name variable, which can be
+      ## useful for some sorting algorithms).
+      [ a:defaultValue = "long" ]
+      attribute form { "long" | "short" | "count" }?,
+      affixes,
+      
+      ## Set the delimiter for names in a name variable (e.g., ", " in
+      ## "Doe, Smith")
+      [ a:defaultValue = ", " ] delimiter,
+      font-formatting,
+      name.name-part*
+    }
+  name.attributes =
+    
+    ## Use to separate the second-to-last and last name of a name list by
+    ## the "and" term or ampersand.
+    attribute and {
+      
+      ## Use the "and" term (e.g., "Doe, Johnson and Smith").
+      "text"
+      | 
+        ## Use the "ampersand" (e.g., "Doe, Johnson & Smith").
+        "symbol"
+    }?,
+    
+    ## Specify when the name delimiter is used between a truncated name list
+    ## and the "et-al" (or "and others") term in case of et-al abbreviation
+    ## (e.g., "Smith, Doe et al." or "Smith, Doe, et al.").
+    [ a:defaultValue = "contextual" ]
+    attribute delimiter-precedes-et-al {
+      
+      ## The name delimiter is only used when the truncated name list
+      ## consists of two or more names.
+      "contextual"
+      | 
+        ## The name delimiter is always used.
+        "always"
+      | 
+        ## The name delimiter is never used.
+        "never"
+      | 
+        ## The name delimiter is only used if the preceding name is inverted as
+        ## a result of the "name-as-sort-order" attribute.
+        "after-inverted-name"
+    }?,
+    
+    ## Specify when the name delimiter is used between the second-to-last
+    ## and last name of a non-truncated name list. Only has an effect when
+    ## the "and" term or ampersand is used (e.g., "Doe and Smith" or "Doe,
+    ## and Smith").
+    [ a:defaultValue = "contextual" ]
+    attribute delimiter-precedes-last {
+      
+      ## The name delimiter is only used when the name list consists of
+      ## three or more names.
+      "contextual"
+      | 
+        ## The name delimiter is always used.
+        "always"
+      | 
+        ## The name delimiter is never used.
+        "never"
+      | 
+        ## The name delimiter is only used if the preceding name is inverted as
+        ## a result of the "name-as-sort-order" attribute.
+        "after-inverted-name"
+    }?,
+    
+    ## Set the minimum number of names needed in a name variable to activate
+    ## et-al abbreviation.
+    attribute et-al-min { xsd:integer }?,
+    
+    ## Set the number of names to render when et-al abbreviation is active.
+    attribute et-al-use-first { xsd:integer }?,
+    
+    ## As "et-al-min", but only affecting subsequent citations to an item.
+    attribute et-al-subsequent-min { xsd:integer }?,
+    
+    ## As "et-al-use-first", but only affecting subsequent citations to an
+    ## item.
+    attribute et-al-subsequent-use-first { xsd:integer }?,
+    
+    ## If set to "true", the "et-al" (or "and others") term is replaced by
+    ## an ellipsis followed by the last name of the name variable.
+    [ a:defaultValue = "false" ]
+    attribute et-al-use-last { xsd:boolean }?,
+    
+    ## If set to "false", names are not initialized and "initialize-with"
+    ## only affects initials already present in the input data.
+    [ a:defaultValue = "true" ] attribute initialize { xsd:boolean }?,
+    
+    ## Activate initializing of given names. The attribute value is appended
+    ## to each initial (e.g., with ". ", "Orson Welles" becomes "O. Welles").
+    attribute initialize-with { text }?,
+    
+    ## Specify whether (and which) names should be rendered in their sort
+    ## order (e.g., "Doe, John" instead of "John Doe").
+    attribute name-as-sort-order {
+      
+      ## Render the first name of each name variable in sort order.
+      "first"
+      | 
+        ## Render all names in sort order.
+        "all"
+    }?,
+    
+    ## Sets the delimiter for name-parts that have switched positions as a
+    ## result of "name-as-sort-order" (e.g., ", " in "Doe, John").
+    [ a:defaultValue = ", " ] attribute sort-separator { text }?
+  name.name-part =
+    
+    ## Use to format individual name parts (e.g., "Jane DOE").
+    element cs:name-part {
+      attribute name { "family" | "given" },
+      affixes,
+      font-formatting,
+      text-case
+    }
+  names.et-al =
+    
+    ## Specify the term used for et-al abbreviation and its formatting.
+    element cs:et-al {
+      
+      ## Select the term to use for et-al abbreviation.
+      [ a:defaultValue = "et-al" ]
+      attribute term { "et-al" | "and others" }?,
+      font-formatting
+    }
+  
+  ## Inherits variable from the parent cs:names element.
+  names.label =
+    element cs:label {
+      [ a:defaultValue = "long" ] attribute form { term.form }?,
+      label.attributes-shared
+    }
+  names.substitute =
+    
+    ## Specify substitution options when the name variables selected on the
+    ## parent cs:names element are empty.
+    element cs:substitute { (substitute.names | rendering-element)+ }
+  
+  ## Short version of cs:names, without children, allowed in cs:substitute.
+  substitute.names = element cs:names { names.attributes }
+}
+# ==============================================================================
+
+## cs:date Rendering Element
+div {
+  rendering-element.date =
+    element cs:date {
+      attribute variable { variables.dates },
+      ((
+        ## Limit the date parts rendered.
+        [ a:defaultValue = "year-month-day" ]
+        attribute date-parts {
+          
+          ## Year, month and day
+          "year-month-day"
+          | 
+            ## Year and month
+            "year-month"
+          | 
+            ## Year only
+            "year"
+        }?,
+        date.form,
+        rendering-element.date.date-part.localized*)
+       | (rendering-element.date.date-part.non-localized+, delimiter)),
+      affixes,
+      display,
+      font-formatting,
+      text-case
+    }
+  rendering-element.date.date-part.localized =
+    
+    ## Specify overriding formatting for localized dates (affixes
+    ## cannot be overridden, as these are considered locale-specific).
+    ## Example uses are forcing the use of leading-zeros, or of the
+    ## "short" month form. Has no effect on which, and in what order,
+    ## date parts are rendered.
+    element cs:date-part {
+      font-formatting, text-case, (day | month | year)
+    }
+  rendering-element.date.date-part.non-localized =
+    
+    ## Specify, in the desired order, the date parts that should be
+    ## rendered and their formatting.
+    element cs:date-part {
+      affixes, font-formatting, text-case, (day | month | year)
+    }
+  day =
+    attribute name { "day" },
+    
+    ## Day forms: "numeric" ("5"), "numeric-leading-zeros" ("05"), "ordinal"
+    ## ("5th").
+    [ a:defaultValue = "numeric" ]
+    attribute form { "numeric" | "numeric-leading-zeros" | "ordinal" }?,
+    range-delimiter
+  month =
+    attribute name { "month" },
+    
+    ## Months forms: "long" (e.g., "January"), "short" ("Jan."), "numeric"
+    ## ("1"), and "numeric-leading-zeros" ("01").
+    [ a:defaultValue = "long" ]
+    attribute form {
+      "long" | "short" | "numeric" | "numeric-leading-zeros"
+    }?,
+    range-delimiter,
+    strip-periods
+  year =
+    attribute name { "year" },
+    
+    ## Year forms: "long" ("2005"), "short" ("05").
+    [ a:defaultValue = "long" ] attribute form { "short" | "long" }?,
+    range-delimiter
+  range-delimiter =
+    
+    ## Specify a delimiter for date ranges (by default the en-dash). A custom
+    ## delimiter is retrieved from the largest date part ("day", "month" or
+    ## "year") that differs between the two dates.
+    [ a:defaultValue = "–" ] attribute range-delimiter { text }?
+}
+# ==============================================================================
+
+## cs:text Rendering Element
+div {
+  rendering-element.text =
+    
+    ## Use to call macros, render variables, terms, or verbatim text.
+    element cs:text {
+      text.attributes,
+      affixes,
+      display,
+      font-formatting,
+      quotes,
+      strip-periods,
+      text-case
+    }
+  text.attributes =
+    
+    ## Select a macro.
+    attribute macro { xsd:NMTOKEN }
+    | (
+       ## Select a term.
+       attribute term { terms },
+       [ a:defaultValue = "long" ] attribute form { term.form }?,
+       
+       ## Specify term plurality: singular ("false") or plural ("true").
+       [ a:defaultValue = "false" ] attribute plural { xsd:boolean }?)
+    | 
+      ## Specify verbatim text.
+      attribute value { text }
+    | (
+       ## Select a variable.
+       attribute variable { variables.standard },
+       [ a:defaultValue = "long" ] attribute form { "short" | "long" }?)
+}
+# ==============================================================================
+
+## cs:number Rendering Element
+div {
+  rendering-element.number =
+    
+    ## Use to render a number variable.
+    element cs:number {
+      number.attributes, affixes, display, font-formatting, text-case
+    }
+  number.attributes =
+    attribute variable { variables.numbers },
+    
+    ## Number forms: "numeric" ("4"), "ordinal" ("4th"), "long-ordinal"
+    ## ("fourth"), "roman" ("iv").
+    [ a:defaultValue = "numeric" ]
+    attribute form { "numeric" | "ordinal" | "long-ordinal" | "roman" }?
+}
+# ==============================================================================
+
+## cs:label Rendering Element
+div {
+  rendering-element.label =
+    
+    ## Use to render a term whose pluralization depends on the content of a
+    ## variable. E.g., if "page" variable holds a range, the plural label
+    ## "pp." is selected instead of the singular "p.".
+    element cs:label { label.attributes, label.attributes-shared }
+  label.attributes =
+    attribute variable { variables.numbers | "locator" | "page" },
+    [ a:defaultValue = "long" ]
+    attribute form { "long" | "short" | "symbol" }?
+  label.attributes-shared =
+    
+    ## Specify when the plural version of a term is selected.
+    [ a:defaultValue = "contextual" ]
+    attribute plural { "always" | "never" | "contextual" }?,
+    affixes,
+    font-formatting,
+    strip-periods,
+    text-case
+}
+# ==============================================================================
+
+## cs:group Rendering Element
+div {
+  rendering-element.group =
+    
+    ## Use to group rendering elements. Groups are useful for setting a
+    ## delimiter for the group children, for organizing the layout of
+    ## bibliographic entries (using the "display" attribute), and for
+    ## suppressing the rendering of terms and verbatim text when variables
+    ## are empty.
+    element cs:group {
+      group.attributes,
+      affixes,
+      delimiter,
+      display,
+      font-formatting,
+      rendering-element+
+    }
+  group.attributes = notAllowed?
+}
+# ==============================================================================
+
+## Style Options
+div {
+  style.options =
+    style.demote-non-dropping-particle,
+    style.initialize-with-hyphen,
+    style.page-range-format,
+    names-inheritable-options,
+    name-inheritable-options
+  citation.options =
+    citation.cite-group-delimiter,
+    citation.collapse-options,
+    citation.disambiguate-options,
+    citation.near-note-distance,
+    names-inheritable-options,
+    name-inheritable-options
+  bibliography.options =
+    bibliography.hanging-indent,
+    bibliography.line-formatting-options,
+    bibliography.second-field-align,
+    bibliography.subsequent-author-substitute-options,
+    names-inheritable-options,
+    name-inheritable-options
+  style.demote-non-dropping-particle =
+    
+    ## Specify whether the non-dropping particle is demoted in inverted
+    ## names (e.g., "Koning, W. de").
+    [ a:defaultValue = "display-and-sort" ]
+    attribute demote-non-dropping-particle {
+      "never" | "sort-only" | "display-and-sort"
+    }?
+  style.initialize-with-hyphen =
+    
+    ## Specify whether compound given names (e.g., "Jean-Luc") are
+    ## initialized with ("J-L") or without a hyphen ("JL").
+    [ a:defaultValue = "true" ]
+    attribute initialize-with-hyphen { xsd:boolean }?
+  style.page-range-format =
+    
+    ## Reformat page ranges in the "page" variable.
+    attribute page-range-format {
+      "expanded"
+      | "minimal"
+      | "minimal-two"
+      | "chicago"
+      | "chicago-15"
+      | "chicago-16"
+    }?
+  citation.cite-group-delimiter =
+    
+    ## Activate cite grouping and specify the delimiter for cites within a
+    ## cite group.
+    [ a:defaultValue = ", " ] attribute cite-group-delimiter { text }?
+  citation.collapse-options =
+    
+    ## Activate cite grouping and specify the method of citation collapsing.
+    attribute collapse {
+      
+      ## Collapse ranges of numeric cites, e.g. from "[1,2,3]" to "[1-3]".
+      "citation-number"
+      | 
+        ## Collapse cites by suppressing repeated names, e.g. from "(Doe
+        ## 2000, Doe 2001)" to "(Doe 2000, 2001)".
+        "year"
+      | 
+        ## Collapse cites as with "year", but also suppresses repeated
+        ## years, e.g. from "(Doe 2000a, Doe 2000b)" to "(Doe 2000a, b)".
+        "year-suffix"
+      | 
+        ## Collapses cites as with "year-suffix", but also collapses
+        ## ranges of year-suffixes, e.g. from "(Doe 2000a, Doe 2000b,
+        ## Doe 2000c)" to "(Doe 2000a-c)".
+        "year-suffix-ranged"
+    }?,
+    
+    ## Specify the delimiter between year-suffixes. Defaults to the cite
+    ## delimiter.
+    attribute year-suffix-delimiter { text }?,
+    
+    ## Specify the delimiter following a group of collapsed cites. Defaults
+    ## to the cite delimiter.
+    attribute after-collapse-delimiter { text }?
+  citation.disambiguate-options =
+    
+    ## Set to "true" to activate disambiguation by showing names that were
+    ## originally hidden as a result of et-al abbreviation.
+    [ a:defaultValue = "false" ]
+    attribute disambiguate-add-names { xsd:boolean }?,
+    
+    ## Set to "true" to activate disambiguation by expanding names, showing
+    ## initials or full given names.
+    [ a:defaultValue = "false" ]
+    attribute disambiguate-add-givenname { xsd:boolean }?,
+    
+    ## Set to "true" to activate disambiguation by adding year-suffixes
+    ## (e.g., "(Doe 2007a, Doe 2007b)") for items from the same author(s)
+    ## and year.
+    [ a:defaultValue = "false" ]
+    attribute disambiguate-add-year-suffix { xsd:boolean }?,
+    
+    ## Specify how name are expanded for disambiguation.
+    [ a:defaultValue = "by-cite" ]
+    attribute givenname-disambiguation-rule {
+      
+      ## Each ambiguous names is progressively transformed until
+      ## disambiguated (when disambiguation is not possible, the name
+      ## remains in its original form).
+      "all-names"
+      | 
+        ## As "all-names", but name expansion is limited to showing
+        ## initials.
+        "all-names-with-initials"
+      | 
+        ## As "all-names", but disambiguation is limited to the first name
+        ## of each cite.
+        "primary-name"
+      | 
+        ## As "all-names-with-initials", but disambiguation is limited to
+        ## the first name of each cite.
+        "primary-name-with-initials"
+      | 
+        ## As "all-names", but only ambiguous names in ambiguous cites are
+        ## expanded.
+        "by-cite"
+    }?
+  citation.near-note-distance =
+    
+    ## Set the number of preceding notes (footnotes or endnotes) within
+    ## which the current item needs to have been previously cited in order
+    ## for the "near-note" position to be "true".
+    [ a:defaultValue = "5" ]
+    attribute near-note-distance { xsd:integer }?
+  bibliography.hanging-indent =
+    
+    ## Set to "true" to render bibliographic entries with hanging indents.
+    [ a:defaultValue = "false" ]
+    attribute hanging-indent { xsd:boolean }?
+  bibliography.line-formatting-options =
+    
+    ## Set the spacing between bibliographic entries.
+    [ a:defaultValue = "1" ]
+    attribute entry-spacing { xsd:nonNegativeInteger }?,
+    
+    ## Set the spacing between bibliographic lines.
+    [ a:defaultValue = "1" ]
+    attribute line-spacing {
+      xsd:integer { minExclusive = "0" }
+    }?
+  bibliography.second-field-align =
+    
+    ## Use to align any subsequent lines of bibliographic entries with the
+    ## beginning of the second field.
+    attribute second-field-align {
+      
+      ## Align the first field with the margin.
+      "flush"
+      | 
+        ## Put the first field in the margin and align all subsequent
+        ## lines of text with the margin.
+        "margin"
+    }?
+  bibliography.subsequent-author-substitute-options =
+    
+    ## Substitute names that repeat in subsequent bibliographic entries by
+    ## the attribute value.
+    attribute subsequent-author-substitute { text }?,
+    
+    ## Specify the method of substitution of names repeated in subsequent
+    ## bibliographic entries.
+    [ a:defaultValue = "complete-all" ]
+    attribute subsequent-author-substitute-rule {
+      
+      ## Requires a match of all rendered names in the name variable, and
+      ## substitutes once for all names.
+      "complete-all"
+      | 
+        ## Requires a match of all rendered names in the name variable,
+        ## and substitutes for each name.
+        "complete-each"
+      | 
+        ## Substitutes for each name, until the first mismatch.
+        "partial-each"
+      | 
+        ## Substitutes the first name if it matches.
+        "partial-first"
+    }?
+  
+  ## Options affecting cs:names, for cs:style, cs:citation and cs:bibliography.
+  names-inheritable-options =
+    
+    ## Inheritable name option, companion for "delimiter" on cs:names.
+    attribute names-delimiter { text }?
+  
+  ## Options affecting cs:name, for cs:style, cs:citation and cs:bibliography.
+  name-inheritable-options =
+    name.attributes,
+    
+    ## Inheritable name option, companion for "delimiter" on cs:name.
+    attribute name-delimiter { text }?,
+    
+    ## Inheritable name option, companion for "form" on cs:name.
+    [ a:defaultValue = "long" ]
+    attribute name-form { "long" | "short" | "count" }?
+}
+# ==============================================================================
+
+## cs:sort - Sorting
+div {
+  sort =
+    
+    ## Specify how cites and bibliographic entries should be sorted. By
+    ## default, items appear in the order in which they were cited.
+    element cs:sort { sort.key+ }
+  sort.key =
+    element cs:key {
+      (attribute variable { variables }
+       | attribute macro { xsd:NMTOKEN }),
+      
+      ## The minimum number of names needed in a name variable to activate
+      ## name list truncation. Overrides the values set on any
+      ## "et-al-(subsequent-)min" attributes.
+      attribute names-min { xsd:integer }?,
+      
+      ## The number of names to render when name list truncation is
+      ## activated. Overrides the values set on the
+      ## "et-al-(subsequent-)use-first" attributes.
+      attribute names-use-first { xsd:integer }?,
+      
+      ## Use to override the value of the "et-at-use-last" attribute.
+      attribute names-use-last { xsd:boolean }?,
+      
+      ## Select between an ascending and descending sort.
+      [ a:defaultValue = "ascending" ]
+      attribute sort { "ascending" | "descending" }?
+    }
+}
+# ==============================================================================
+
+## Formatting attributes.
+div {
+  affixes =
+    [ a:defaultValue = "" ] attribute prefix { text }?,
+    [ a:defaultValue = "" ] attribute suffix { text }?
+  delimiter = attribute delimiter { text }?
+  display =
+    
+    ## By default, bibliographic entries consist of continuous runs of text.
+    ## With the "display" attribute, portions of each entry can be
+    ## individually positioned.
+    attribute display {
+      
+      ## Places the content in a block stretching from margin to margin.
+      "block"
+      | 
+        ## Places the content in a block starting at the left margin.
+        "left-margin"
+      | 
+        ## Places the content in a block to the right of a preceding
+        ## "left-margin" block.
+        "right-inline"
+      | 
+        ## Places the content in a block indented to the right by a standard
+        ## amount.
+        "indent"
+    }?
+  
+  ## The font-formatting attributes are based on those of CSS and XSL-FO.
+  font-formatting =
+    [ a:defaultValue = "normal" ]
+    attribute font-style { "italic" | "normal" | "oblique" }?,
+    [ a:defaultValue = "normal" ]
+    attribute font-variant { "normal" | "small-caps" }?,
+    [ a:defaultValue = "normal" ]
+    attribute font-weight { "normal" | "bold" | "light" }?,
+    [ a:defaultValue = "none" ]
+    attribute text-decoration { "none" | "underline" }?,
+    [ a:defaultValue = "baseline" ]
+    attribute vertical-align { "baseline" | "sup" | "sub" }?
+  quotes =
+    
+    ## When set to "true", quotes are placed around the rendered text.
+    [ a:defaultValue = "false" ] attribute quotes { xsd:boolean }?
+  strip-periods =
+    
+    ## When set to "true", periods are removed from the rendered text.
+    [ a:defaultValue = "false" ]
+    attribute strip-periods { xsd:boolean }?
+  text-case =
+    attribute text-case {
+      
+      ## Renders text in lowercase.
+      "lowercase"
+      | 
+        ## Renders text in uppercase.
+        "uppercase"
+      | 
+        ## Capitalizes the first character (other characters remain in
+        ## their original case).
+        "capitalize-first"
+      | 
+        ## Capitalizes the first character of every word (other characters
+        ## remain in their original case).
+        "capitalize-all"
+      | 
+        ## Renders text in title case.
+        "title"
+      | 
+        ## Renders text in sentence case.
+        ## Deprecated. Will be removed in CSL 1.1
+        "sentence"
+    }?
+}