anchor.diff:  ### Blueprint AST
   
   ```
  -vnd.apiblueprint.ast.raw+json
  -vnd.apiblueprint.ast.raw+yaml
  +application/vnd.apiblueprint.ast.raw+json
  +application/vnd.apiblueprint.ast.raw+yaml
   ```
   
   Serialized API Blueprint AST is represented either in its JSON or YAML format as defined in [API Blueprint AST Serialization Media Types](https://github.com/apiaryio/api-blueprint-ast).
   
  -### Parse Result 
  -
  -```
  -vnd.apiblueprint.parseresult.raw+json
  -vnd.apiblueprint.parseresult.raw+yaml
  +### Parse Result
  +
  +```
  +application/vnd.apiblueprint.parseresult.raw+json
  +application/vnd.apiblueprint.parseresult.raw+yaml
   ```
   
   Result of API Blueprint parsing operation. This media types includes Blueprint AST media types and additional information – parser source code annotations (warnings and errors). Defined in [Parse Result Media Types](https://github.com/apiaryio/api-blueprint-ast/blob/master/Parse%20Result.md).
  
positive.code:                                 schema:
          error: null
          warnings: []
          
  
  ## Blueprint Composer [/composer]
  API Blueprint AST Media Types to API Blueprint conversions as provided by the [Matter Compiler](https://github.com/apiaryio/matter_compiler) tool.
  
  ### Compose [POST]
  Convert a serialized API Blueprint AST (`vnd.apiblueprint.ast.raw+json` or `vnd.apiblueprint.ast.raw+yaml`) into API Blueprint (`vnd.apiblueprint+markdown`).
  
  + Request (vnd.apiblueprint.ast.raw+yaml; version=2.0)
  
          _version: 2.0
          metadata:
  
negative.code: 
                      Hello World!
  
  + Response 200 (application/vnd.apiblueprint.parseresult.raw+yaml; version=1.0)
  
          _version: 1.0
          ast:
              _version: 2.0
              metadata:
              name:
  