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ODB++协议标准.pdf
InfoHub
Table of Contents
Chapter 1 ODB++ Format Specification
Geometric Entities
Self-Intersecting Polygons (SIP)
Changes to ODB++ Format
8.0 Update 4
8.0 Update 3
8.0 Update 2
8.0 Update 1
ODB++ 8.0
Chapter 2 Basic Principles
File System
Legal Entity Names
Units of Measurement
Attributes
Attribute Definition Syntax
Text
Unique ID
Format Definition
Extensible Content
Large File Compression
Structured Text Files
Line Record Text Files
Coordinates
Angles
Rotation / Mirroring
Symbols
Standard Symbols
User-Defined Symbols
Lines and Arcs Drawn with Symbols
Surfaces
Chapter 3 Product Model Tree
Charts
product_model_name>steps
product_model_name>steps>layers
product_model_name>wheels
Chapter 4 Product Model Entities
steps
symbols (Standard and User-Defined Symbols)
matrix (Product Model Matrix)
Fields in the STEP Array
Fields in the LAYER Array
Recommended Buildup
Layer Types to Support Backdrill and Dual Diameter Drill
Layer Types to Support Flex/Rigid Flex Manufacturing
misc (Miscellaneous)
attrlist (Attributes Used in a Product Model)
last_save (Last Time Product Model Saved)
info (Basic Product Model Information)
wheels (Gerber and Tool Wheels)
attrlist (Attributes Values)
dcodes
fonts (Fonts Used in Product Model)
standard (Standard Font)
Standard Font Legal Characters
input
user
ext (Extension)
Chapter 5 Step Entities
stephdr (Step Header)
attrlist (Attribute List)
layers
Netlists
cadnet/netlist (cadnet)
refnet/netlist (Reference)
profile (Outline Shape of Step)
bom (Bill of Materials)
bom
Description of BOM File
files (Source Files)
Variant Implementation
eda (Electronic Design Automation)
data
Main Records:
Outline Records:
Main Record Descriptions
HDR—File Header
LYR—Layer Names
PRP—Property Record
Net Attributes Header
NET—Electrical Net Record
SNT—Subnet Record
FID—Feature ID Record
PKG—Package Record
PIN—Pin Record
FGR—Feature Group Record
Outline Records
Net Attributes
Chapter 6 Layer Entities
attrlist (Attribute List)
layer profile
features
The Field
Line Records
Pad Records
Arc Records
Text Records
Barcode Records
Surface Records
components
Component Description Record
BOM Description Records
tools (Drill Tools)
notes (Electronic Product Model Notes)
Appendix 1 Symbol Definitions
Basic Standard Symbols
Symbols Suitable for Solder Stencil Design
Other Symbol Information
Rotated Standard Symbols
Rounded/Chamfered Rectangles
Corner Size
Obsolete Symbols
Appendix 2 System Attributes
ODB++ System Attributes
ODB++ System Attributes by Area
Product (sysattr)
DFM (sysattr.dfm)
Fabrication (sysattr.fab)
Assembly (sysattr.assy)
Test (sysattr.test)
Generic (sysattr.gen)
Appendix 3 Standard Font
Font Format Specific Information
Standard Font Description
Appendix 4 Frequently Asked Questions
Documentation Feedback
ODB++ Format Specification
Format Version 8.0 Update 4
August 2014
© 1993-2014 Mentor Graphics Corporation
All rights reserved.
This document contains information that is proprietary to Mentor Graphics Corporation ("Mentor Graphics"). This
document is made freely available, but is not approved for re-distribution without prior written consent by Mentor
Graphics. Further copies can be downloaded from www.odb-sa.com. Refer to that site for the latest electronic version.
This document is for information purposes. Mentor Graphics reserves the right to make changes in
specifications and other information contained in this document without prior notice, and the user should,
in all cases, consult www.odb-sa.com to determine whether any changes have been made.
ODB++ Format and the ODB++ Specification are the sole property of Mentor Graphics or its licensors.
Mentor Graphics does not authorize any unapproved derivative versions of the ODB++ Format. In
obtaining this document, the user shall not harm Mentor Graphics' interest in the ODB++ Format in any
way, including but not limited to: (i) renaming the ODB++ Format; (ii) communicating that the ODB++
Format is owned by anyone other than Mentor Graphics; (iii) associating the ODB++ Format with data
that does not conform to the ODB++ Format; or (iv) modifying the graphical logo representing the
ODB++ Format.
Download of the ODB++ Specification does not grant a license to develop software interfaces based on
the format specification. We openly encourage users to apply for a license to develop ODB++-based
software as a Solutions Development Partner within the ODB++ Solutions Alliance at www.odb-sa.com.
No representation or other affirmation of fact contained in this publication shall be deemed to be a
warranty or give rise to any liability of Mentor Graphics whatsoever.
MENTOR GRAPHICS MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS
FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT OF INTELLECTUAL PROPERTY.
MENTOR GRAPHICS SHALL NOT BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT,
SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO
LOST PROFITS) ARISING OUT OF OR RELATED TO THIS PUBLICATION OR THE INFORMATION
CONTAINED IN IT, EVEN IF MENTOR GRAPHICS HAS BEEN ADVISED OF THE POSSIBILITY OF
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Table of Contents
Chapter 1
ODB++ Format Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Geometric Entities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Intersecting Polygons (SIP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changes to ODB++ Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.0 Update 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.0 Update 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.0 Update 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.0 Update 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ODB++ 8.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2
Basic Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Legal Entity Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Units of Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attribute Definition Syntax. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unique ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Format Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extensible Content. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Large File Compression. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Structured Text Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Record Text Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coordinates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Angles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rotation / Mirroring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User-Defined Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lines and Arcs Drawn with Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3
Product Model Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
product_model_name>steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
product_model_name>steps>layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
product_model_name>wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ODB++ Format Specification, 8.0 Update 4
August 2014
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Chapter 4
Product Model Entities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
symbols (Standard and User-Defined Symbols) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
/attrlist (Attribute List). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
/features (Symbol Features) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
matrix (Product Model Matrix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fields in the STEP Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fields in the LAYER Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Buildup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Layer Types to Support Backdrill and Dual Diameter Drill. . . . . . . . . . . . . . . . . . . . . . . .
Layer Types to Support Flex/Rigid Flex Manufacturing . . . . . . . . . . . . . . . . . . . . . . . . . .
misc (Miscellaneous) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
attrlist (Attributes Used in a Product Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
last_save (Last Time Product Model Saved) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
info (Basic Product Model Information). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
wheels (Gerber and Tool Wheels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
attrlist (Attributes Values). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
dcodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
fonts (Fonts Used in Product Model). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
standard (Standard Font). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Font Legal Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
user. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ext (Extension) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 5
Step Entities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stephdr (Step Header) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
attrlist (Attribute List) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Netlists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
cadnet/netlist (cadnet) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
refnet/netlist (Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
profile (Outline Shape of Step) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
bom (Bill of Materials) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
bom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
files (Source Files) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Variant Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
eda (Electronic Design Automation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Record Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outline Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 6
Layer Entities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
attrlist (Attribute List) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ODB++ Format Specification, 8.0 Update 4
August 2014
layer profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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99
The Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Component Description Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
BOM Description Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
tools (Drill Tools) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
notes (Electronic Product Model Notes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Appendix 1
Symbol Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Basic Standard Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Symbols Suitable for Solder Stencil Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Other Symbol Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Rotated Standard Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Rounded/Chamfered Rectangles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Corner Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Obsolete Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Appendix 2
System Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
ODB++ System Attributes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
ODB++ System Attributes by Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Product (sysattr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
DFM (sysattr.dfm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Fabrication (sysattr.fab) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Assembly (sysattr.assy). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Test (sysattr.test) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Generic (sysattr.gen) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Appendix 3
Standard Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Font Format Specific Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Standard Font Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Appendix 4
Frequently Asked Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
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Chapter 1
ODB++ Format Specification
Competing in global markets requires PCB design organizations to continually seek ways to
more effectively communicate their product definition data to fabrication, assembly and test
organizations. The goal is to simultaneously maximize three aspects:
speed in transferring a new product design into the manufacturing process
accuracy of communication of the designer's intentions to the manufacturer
opportunities for reduction in total manufacturing cost
All the data transferred to manufacturers by a designer that defines his PCB for the purposes of
bare board fabrication, assembly and test can be referred to as the manufacturing product
model. To the manufacturer, this product model defines 'what' should be manufactured and
delivered back to the product owner. The manufacturer's task is to validate the
manufacturability of the product, then derive and execute the optimal manufacturing process for
its manufacture.
The ODB++ data exchange format is the most widely accepted, integrated product model
format for efficiently handing off a PCB from design into manufacturing. The ODB++ format is
a simple yet comprehensive description of all entities necessary to answer the question of 'what'
needs to be manufactured, covering fabrication, assembly and test of a PCB.
The following sections contain a full description of the ODB++ format:
Geometric Entities
Changes to ODB++ Format
Product Model Tree
Step Entities
Symbol Definitions
Frequently Asked Questions
This section relates to:
Self-Intersecting Polygons (SIP)
Basic Principles
Product Model Entities
Layer Entities
System Attributes
Geometric Entities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Intersecting Polygons (SIP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changes to ODB++ Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ODB++ Format Specification
Geometric Entities
Geometric Entities
The ODB++ format uses geometric primitives called features to describe product model
geometry. Features are stored in the feature containers of layers, profiles, and symbols. The
types of geometric entities supported by the ODB++ format are the pad, line, arc, surface, and
text.
These primitives are defined by the concept of a symbol and a contour. A symbol is either one
of the geometric primitives supported by the ODB++ format described in Basic Standard
Symbols or a combination of them.
A contour is represented by single or multiple islands. An island is the area inside a boundary
that consists of straight and circular segments. Islands in a contour do not touch or intersect with
one another. Each island can contain holes that are also defined by a boundary. Those
boundaries are referred to as polygons. The boundary of an island is oriented clockwise; the
boundary of a hole is oriented counter-clockwise.
Arc—is created by dragging a symbol along a circular segment. Arcs are defined by their start
point, end point, center, direction (clockwise or counter-clockwise), and symbol.
Note
When the start and end-point of an arc coincide, it is considered a 360 degree arc. There
are no single-point arcs in the ODB++ format.
Surface—is a solid polygon that can contain non-intersecting islands, that themselves can
contain any number of holes.
Text—consists of letters drawn with a font or barcode. Text is defined by a text string, font, and
text size.
Features can be positive and negative. Positive features cover all underlying parts of features
previously added to the feature container. Negative features erase all underlying parts of
features previously added to feature container.
Pad—the most primitive geometric entity. A pad is a point made with symbol. Pads are defined
by their location and symbol.
Line—is created by dragging a symbol along a straight segment. Lines are defined by their start
point, end point, and symbol.
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ODB++ Format Specification, 8.0 Update 4
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