errors

var (
	// core
	ErrMissingID              = errors.New("resource ID MUST be greater than zero")
	ErrDuplicatedID           = errors.New("IDs MUST be unique among all resources under same Model")
	ErrMissingResource        = errors.New("resource MUST be defined prior to referencing")
	ErrDuplicatedIndices      = errors.New("indices v1, v2 and v3 MUST be distinct")
	ErrIndexOutOfBounds       = errors.New("index is bigger than referenced slice")
	ErrInsufficientVertices   = errors.New("mesh MUST contain at least 3 vertices to form a solid body")
	ErrInsufficientTriangles  = errors.New("mesh MUST contain at least 4 triangles to form a solid body")
	ErrComponentsPID          = errors.New("MUST NOT assign pid to objects that contain components")
	ErrOPCPartName            = errors.New("part name MUST conform to the syntax specified in the OPC specification")
	ErrOPCRelTarget           = errors.New("relationship target part MUST be included in the 3MF document")
	ErrOPCDuplicatedRel       = errors.New("there MUST NOT be more than one relationship of a given type from one part to a second part")
	ErrOPCContentType         = errors.New("part MUST use an appropriate content type specified")
	ErrOPCDuplicatedTicket    = errors.New("each model part MUST attach no more than one PrintTicket")
	ErrOPCDuplicatedModelName = errors.New("model part names MUST be unique")
	ErrMetadataName           = errors.New("names without a namespace MUST be restricted to predefined values")
	ErrMetadataNamespace      = errors.New("namespace MUST be declared on the model")
	ErrMetadataDuplicated     = errors.New("names MUST NOT be duplicated")
	ErrOtherItem              = errors.New("MUST NOT reference objects of type other")
	ErrNonObject              = errors.New("MUST NOT reference non-object resources")
	ErrRequiredExt            = errors.New("unsupported required extension")
	ErrEmptyResourceProps     = errors.New("resource properties MUST NOT be empty")
	ErrRecursion              = errors.New("MUST NOT contain recursive references")
	ErrInvalidObject          = errors.New("MUST contain a mesh or components")
	ErrMeshConsistency        = errors.New("mesh has non-manifold edges without consistent triangle orientation")
)