Hawk extends the regular EOL facilities to be able to query the metamodels registered within the instance:

• Model.types lists all the types registered in Hawk (EClass instances for EMF).
• Model.metamodels lists all the metamodels registered in Hawk (EPackage instances for EMF).
• Model.files lists all the files indexed by Hawk (may be limited through the context).
• Model.getTypeOf(obj) retrieves the type of the object obj.
• Model.getFileOf(obj) retrieves the first file containing the object obj.
• Model.getFilesOf(obj) retrieves all the files containing the object obj.

For a metamodel mm, these attributes are available:

• mm.uri is the namespace URI of the metamodel.
• mm.metamodelType is the type of metamodel that was registered.
• mm.dependencies lists the metamodels this metamodel depends on (usually at least the Ecore metamodel for EMF-based metamodels).
• mm.types lists the types defined in this metamodel.
• mm.resource retrieves the original string representation for this metamodel (the original .ecore file for EMF).

For a type t, these attributes are available:

• t.metamodel retrieves the metamodel that defines the type.
• t.all retrieves all instances of that type efficiently (includes subtypes).
• t.name retrieves the name of the type.
• t.attributes lists the attributes of the type, as slots (see below).
• t.references lists the references of the type, as slots.
• t.features lists the attributes and references of the type.

For a slot sl, these attributes are available:

• sl.name: name of the slot.
• sl.type: type of the value of the slot.
• sl.isMany: true if this is a multi-valued slot.
• sl.isOrdered: true if the values should follow some order.
• sl.isAttribute: true if this is an attribute slot.
• sl.isReference: true if this is a reference slot.
• sl.isUnique: true if the value for this slot should be unique within its model.

For a file f, these attributes are available:

• f.path: returns the path of the file within the repository (e.g. /input.xmi).
• f.repository: returns the URL of the repository (e.g. file:///home/myuser/models).
• f.roots: returns the root model elements in the file.
• f.contents: returns all the model elements in the file.