1 files changed, 56 insertions, 7 deletions
diff --git a/document_attribute.go b/document_attribute.go
index c7b2c83..31dbb50 100644
--- a/document_attribute.go
+++ b/document_attribute.go
@@ -5,19 +5,68 @@ package asciidoctor
 
 import "strings"
 
+// List of document attribute.
+const (
+	DocAttrAuthor      = `author`       // May contain the first author full name only.
+	DocAttrAuthorNames = `author_names` // List of author full names, separated by comma.
+	DocAttrDescription = `description`
+	DocAttrGenerator   = `generator`
+	DocAttrKeywords    = `keywords`
+
+	docAttrAuthorInitials  = `authorinitials`
+	docAttrDocTitle        = `doctitle`
+	docAttrEmail           = attrValueEmail
+	docAttrFirstName       = `firstname`
+	docAttrIDPrefix        = `idprefix`
+	docAttrIDSeparator     = `idseparator`
+	docAttrLastName        = `lastname`
+	docAttrLastUpdateLabel = `last-update-label`
+	docAttrLastUpdateValue = `last-update-value`
+	docAttrMiddleName      = `middlename`
+	docAttrNoFooter        = `nofooter`
+	docAttrNoHeader        = `noheader`
+	docAttrNoHeaderFooter  = `no-header-footer`
+	docAttrNoTitle         = `notitle`
+	docAttrRevDate         = `revdate`
+	docAttrRevNumber       = `revnumber`
+	docAttrRevRemark       = `revremark`
+	docAttrSectAnchors     = `sectanchors`
+	docAttrSectIDs         = `sectids`
+	docAttrSectLinks       = `sectlinks`
+	docAttrSectNumLevel    = `sectnumlevels`
+	docAttrSectNums        = `sectnums`
+	docAttrShowTitle       = `showtitle`
+	docAttrTOC             = `toc`
+	docAttrTOCLevels       = `toclevels`
+	docAttrTOCTitle        = `toc-title`
+	docAttrTableCaption    = `table-caption`
+	docAttrTitle           = attrNameTitle
+	docAttrTitleSeparator  = `title-separator`
+	docAttrVersionLabel    = `version-label`
+)
+
+// List of possible document attribute value.
+const (
+	docAttrValueAuto     = `auto`
+	docAttrValueMacro    = `macro`
+	docAttrValuePreamble = `preamble`
+	docAttrValueLeft     = `left`
+	docAttrValueRight    = `right`
+)
+
 // DocumentAttribute contains the mapping of global attribute keys in the
 // headers with its value.
 type DocumentAttribute map[string]string
 
 func newDocumentAttribute() DocumentAttribute {
 	return DocumentAttribute{
-		MetaNameGenerator:       `asciidoctor-go ` + Version,
-		metaNameLastUpdateLabel: `Last updated`,
-		metaNameLastUpdateValue: ``,
-		metaNameSectIDs:         ``,
-		metaNameShowTitle:       ``,
-		metaNameTableCaption:    ``,
-		metaNameVersionLabel:    ``,
+		DocAttrGenerator:       `asciidoctor-go ` + Version,
+		docAttrLastUpdateLabel: `Last updated`,
+		docAttrLastUpdateValue: ``,
+		docAttrSectIDs:         ``,
+		docAttrShowTitle:       ``,
+		docAttrTableCaption:    ``,
+		docAttrVersionLabel:    ``,
 	}
 }