Chapter 8 Working with XML Documents

Working with other XML objects

In addition to elements, attributes, entities, and text, there are several other items that can occur in an XML document. These include the following:

Processing instructions Instructions for applications. The first line of any XML document is a processing instruction with a name of xml. For example:
```
<?xml version='1.0'?>
```
For information on handling processing instructions, see "The DOMProcessingInstruction object" in the PowerDynamo Reference Manual.
Comments A comment embedded in an XML document contains text that is not part of the document's character data. For example:
```

```
For information on handling comments, see "The DOMComment object" in the PowerDynamo Reference Manual.
Notations A declaration for the supported types of external entities that are not parsed. For example:
```
<!NOTATION IMAGE SYSTEM "GIF">
```
For information on handling notations, see "The DOMNotation object" in the PowerDynamo ReferenceManual.
Document type information The DTD is held in the DOMDocumentType object. This object has properties that hold the name of the DTD, as well as listings of the entities and notations declared within the DTD.

The Document Object Model, Level 1, does not specify access to any other information in the DTD.

For information on handling notations, see "The DOMDocumentType object" in the PowerDynamo Reference Manual.