Add Schema Coordinates functions documentation

src/content/graphql-js/APIReference-Language.md

@@ -4,7 +4,7 @@ layout: docs
 category: API Reference
 permalink: /graphql-js/language/
 sublinks: BREAK,getLocation,Kind,lex,parse,parseValue,printSource,visit
-next: /graphql-js/type/
+next: /graphql-js/schema-coordinates/
 ---
 
 The `graphql/language` module is responsible for parsing and operating on the GraphQL language. You can import either from the `graphql/language` module, or from the root `graphql` module. For example:

src/content/graphql-js/APIReference-SchemaCoordinates.md

@@ -0,0 +1,87 @@
+---
+title: graphql/schema-coordinates
+layout: docs
+category: API Reference
+permalink: /graphql-js/schema-coordinates/
+sublinks: parseSchemaCoordinate,printSchemaCoordinate,nodeFromSchemaCoordinate,schemaCoordinateFromNode
+next: /graphql-js/type/
+---
+
+The `graphql/schema-coordinates` module is responsible for parsing and working with Schema Coordinates. You can import either from the `graphql/schema-coordinates` module, or from the root `graphql` module. For example:
+
+```js
+import { SchemaCoordinates } from 'graphql'; // ES6
+var { SchemaCoordinates } = require('graphql'); // CommonJS
+```
+
+## Overview
+
+<ul class="apiIndex">
+  <li>
+    <a href="#parseSchemaCoordinate">
+      <pre>function parseSchemaCoordinate</pre>
+      Parses a Schema Coordinate string according to the Schema Coordinate Grammar
+    </a>
+  </li>
+  <li>
+    <a href="#printSchemaCoordinate">
+      <pre>function printSchemaCoordinate</pre>
+      Prints a Schema Coordinate string from its AST
+    </a>
+  </li>
+  <li>
+    <a href="#nodeFromSchemaCoordinate">
+      <pre>function nodeFromSchemaCoordinate</pre>
+      Returns a GraphQL AST node from its Schema Coordinate and Schema
+    </a>
+  </li>
+  <li>
+    <a href="#schemaCoordinateFromNode">
+      <pre>function schemaCoordinateFromNode</pre>
+      Returns the Schema Coordinate of a GraphQL Schema AST node
+    </a>
+  </li>
+</ul>
+
+## SchemaCoordinates
+
+### parseSchemaCoordinate
+
+```js
+function parseSchemaCoordinate(schemaCoordinate: string): SchemaCoordinateAST
+```
+
+Takes a Schema Coordinate as a string, and returns its corresponding AST
+representation.
+
+### printSchemaCoordinate
+
+```js
+function printSchemaCoordinate(schemaCoordinateAST: SchemaCoordinateAST): string
+```
+
+Serializes a Schema Coordinate AST back into a Schema Coordinate string.
+
+### nodeFromSchemaCoordinate
+
+```js
+function nodeFromSchemaCoordinate(
+    schemaCoordinate: string,
+    schema: GraphQLSchema,
+): ?ASTNode // TODO: Define some subset of ASTNode that Schema Coordinates can represent
+```
+
+Takes a Schema Coordinate and a GraphQLSchema and returns the AST node of the
+corresponding type, field, argument, enum value, or directive in the Schema.
+
+### schemaCoordinateFromNode
+
+```js
+function schemaCoordinateFromNode(
+    // TODO: confirm we can walk up the tree with an ASTNode (such that we don't need a GraphQLSchema as an argument too)
+    node: ASTNode,
+): ?string
+```
+
+Takes a GraphQL Schema AST Node and returns its Schema Coordinate string
+representation.