2012

 Multiple line attributes display four grips similar to MTEXT objects, while
single-line attributes display only one grip.
 When a drawing is saved to AutoCAD 2007 or earlier, a multiple-line
attribute is converted to several single-line attributes, one for every line of
text in the original multiple-line attribute. If the drawing file is opened in
the current release, these single line attributes are automatically merged
back into a multiple-line attribute.
NOTE
If a multiple-line attribute makes a round trip to an earlier release, the
differences between these two types of attributes might result in truncating
very long lines of text and loss of formatting. However, before any characters
are truncated, AutoCAD for Mac displays a message box that lets you cancel
the operation.
Correct Mistakes in Block Attribute Definitions
If you make a mistake, you can use the Properties Inspector palette or DDEDIT
to make limited changes to an attribute definition before it is associated with
a block. If you need to make more extensive changes, delete the attribute
definition and create a new one.
Attach Attributes to Blocks
After you create one or more attribute definitions, you attach the attributes
to a block when you define or redefine that block. When you are prompted
to select the objects to include in the block definition, include in the selection
set any attributes you want to attach to the block.
To use several attributes together, define them and then include them in the
same block. For example, you can define attributes tagged "Type,"
"Manufacturer," “Model,” and “Cost,” and then include them in a block called
CHAIR.
342 | Chapter 7 Define and Reference Blocks