Adds requirement css classes to schema order list

Again. This got overwritten the first time by
b3c27ac

Author: philipashlock

Diff for: v1.1/schema.md

@@ -144,50 +144,58 @@ Further Metadata Field Guidance
 Additional details for each field are provided here broken down into sections for the overarching [Catalog](#Catalog), each [dataset](#dataset), and each dataset's [distribution](#distribution).
 
 
+{: .schema-fields .requirements-key}
+* Key
+	* {: .field-required} Required
+	* {: .field-required-if-applicable} Required if Applicable
+	* {: .field-optional} Expanded (optional)
+
+
+{: .schema-fields}
 * Catalog
-	* [conformsTo](#conformsTo)
-	* [describedBy](#describedBy)
-	* [dataset](#dataset)
-		* [accessLevel](#accessLevel)
-		* [accrualPeriodicity](#accrualPeriodicity)
-		* [bureauCode](#bureauCode)
-		* [conformsTo](#dataset-conformsTo)
-		* [contactPoint](#contactPoint)
-			* [fn](#contactPoint-fn)
-			* [hasEmail](#contactPoint-hasEmail)
-		* [dataQuality](#dataQuality)
-		* [describedBy](#dataset-describedBy)
-		* [describedByType](#dataset-describedByType)
-		* [description](#description)
-		* [distribution](#distribution)
-			* [accessURL](#distribution-accessURL)
-			* [conformsTo](#distribution-conformsTo)
-			* [downloadURL](#distribution-downloadURL)
-			* [describedBy](#distribution-describedBy)
-			* [describedByType](#distribution-describedByType)
-			* [description](#distribution-description)
-			* [format](#distribution-format)
-			* [mediaType](#distribution-mediaType)
-			* [title](#title)
-		* [identifier](#identifier)
-		* [isPartOf](#isPartOf)
-		* [issued](#issued)
-		* [keyword](#keyword)
-		* [landingPage](#landingPage)
-		* [language](#language)
-		* [license](#license)
-		* [modified](#modified)
-		* [primaryITInvestmentUII](#primaryITInvestmentUII)
-		* [programCode](#programCode)
-		* [publisher](#publisher)
-			* [name](#publisher-name)
-			* [subOrganizationOf](#publisher-subOrganizationOf)
-		* [rights](#rights)
-		* [spatial](#spatial)
-		* [systemOfRecords](#systemOfRecords)
-		* [temporal](#temporal)
-		* [theme](#theme)
-		* [title](#title)
+	* {: .field-required}[conformsTo](#conformsTo)
+	* {: .field-optional}[describedBy](#describedBy)
+	* {: .field-required}[dataset](#dataset)
+		* {: .field-required}[accessLevel](#accessLevel)
+		* {: .field-optional}[accrualPeriodicity](#accrualPeriodicity)
+		* {: .field-required}[bureauCode](#bureauCode)
+		* {: .field-optional}[conformsTo](#dataset-conformsTo)
+		* {: .field-required}[contactPoint](#contactPoint)
+			* {: .field-required}[fn](#contactPoint-fn)
+			* {: .field-required}[hasEmail](#contactPoint-hasEmail)
+		* {: .field-required-if-applicable}[dataQuality](#dataQuality)
+		* {: .field-optional}[describedBy](#dataset-describedBy)
+		* {: .field-optional}[describedByType](#dataset-describedByType)
+		* {: .field-required}[description](#description)
+		* {: .field-required-if-applicable}[distribution](#distribution)
+			* {: .field-optional}[accessURL](#distribution-accessURL)
+			* {: .field-optional}[conformsTo](#distribution-conformsTo)
+			* {: .field-required-if-applicable}[downloadURL](#distribution-downloadURL)
+			* {: .field-optional}[describedBy](#distribution-describedBy)
+			* {: .field-optional}[describedByType](#distribution-describedByType)
+			* {: .field-optional}[description](#distribution-description)
+			* {: .field-optional}[format](#distribution-format)
+			* {: .field-required-if-applicable}[mediaType](#distribution-mediaType)
+			* {: .field-optional}[title](#title)
+		* {: .field-required}[identifier](#identifier)
+		* {: .field-optional}[isPartOf](#isPartOf)
+		* {: .field-optional}[issued](#issued)
+		* {: .field-required}[keyword](#keyword)
+		* {: .field-optional}[landingPage](#landingPage)
+		* {: .field-optional}[language](#language)
+		* {: .field-required-if-applicable}[license](#license)
+		* {: .field-required}[modified](#modified)
+		* {: .field-optional}[primaryITInvestmentUII](#primaryITInvestmentUII)
+		* {: .field-required}[programCode](#programCode)
+		* {: .field-required}[publisher](#publisher)
+			* {: .field-required}[name](#publisher-name)
+			* {: .field-optional}[subOrganizationOf](#publisher-subOrganizationOf)
+		* {: .field-required-if-applicable}[rights](#rights)
+		* {: .field-required-if-applicable}[spatial](#spatial)
+		* {: .field-optional}[systemOfRecords](#systemOfRecords)
+		* {: .field-required-if-applicable}[temporal](#temporal)
+		* {: .field-optional}[theme](#theme)
+		* {: .field-required}[title](#title)
 
 
 Catalog Fields {#Catalog}