PBDOM objects
PBDOM_OBJECT, the base
class for PBDOM objects that represent XML nodes, inherits from
the PowerBuilder NonVisualObject class. PBDOM represents node types
by the following classes:
You use methods from these classes to access objects in a
PBDOM node tree.
The PBDOM_BUILDER class does not represent DOM nodes
but can be used to build a PBDOM object tree from XML. It inherits
from the PowerBuilder NonVisualObject class.
The PBDOM_EXCEPTION class inherits from the PowerBuilder
Exception class and provides a method that obtains error codes.
Each of these classes and their methods are described in the
chapters that follow.
Comparing PBDOM objects with W3C DOM and JDOM objects
The following table shows the W3C DOM and JDOM objects that
correspond to each PBDOM object that represents a node in the DOM
tree. Note that although these W3C DOM and JDOM objects correspond
to PBDOM objects, they are not equivalent to the PBDOM objects.
|
PBDOM |
W3C DOM |
JDOM |
|---|---|---|
|
PBDOM_ATTRIBUTE |
ATTRIBUTE_NODE |
Attribute |
|
PBDOM_BUILDER |
None |
DOMBuilder |
|
PBDOM_CDATA |
CDATA_SECTION_NODE |
CDATA |
|
PBDOM_CHARACTERDATA |
CHARACTER_DATA_NODE |
None |
|
PBDOM_COMMENT |
COMMENT_NODE |
Comment |
|
PBDOM_DOCUMENT |
DOCUMENT_NODE |
Document |
|
PBDOM_DOCTYPE |
DOCUMENT_TYPE_NODE |
DocType |
|
PBDOM_ELEMENT |
ELEMENT_NODE |
Element |
|
PBDOM_ENTITYREFERENCE |
ENTITY_REFERENCE_NODE |
EntityRef |
|
PBDOM_OBJECT |
NODE |
None |
|
PBDOM_PROCESSINGINSTURCTION |
PROCESSING_INSTRUCTION_NODE |
Processinginstruction |
|
PBDOM_TEXT |
TEXT_NODE |
Text |
Object hierarchy
The W3C DOM and JDOM object hierarchies also differ from the
PBDOM object hierarchy, which is shown in the following illustration.
Figure 4-1: The PBDOM object hierarchy
For more information about working with PBDOM, see the chapter
on PowerBuilder XML services in Application Techniques.