XMLReader
From Xojo Documentation
Class (inherits from Object)
This is a wrapper class for the latest version of Expat (XML Parser Toolkit). Expat is a library for parsing XML documents.
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Class Constants
The following class constants can be used to test the value in ErrorCode.
| Value | Constant |
|---|---|
| 0 | XML_ERROR_NONE |
| 1 | XML_ERROR_NO_MEMORY |
| 2 | XML_ERROR_SYNTAX |
| 3 | XML_ERROR_NO_ELEMENTS |
| 4 | XML_ERROR_INVALID_TOKEN |
| 5 | XML_ERROR_UNCLOSED_TOKEN |
| 6 | XML_ERROR_PARTIAL_CHAR |
| 7 | XML_ERROR_TAG_MISMATCH |
| 8 | XML_ERROR_DUPLICATE_ATTRIBUTE |
| 9 | XML_ERROR_JUNK_AFTER_DOC_ELEMENT |
| 10 | XML_ERROR_PARAM_ENTITY_REF |
| 11 | XML_ERROR_UNDEFINED_ENTITY |
| 12 | XML_ERROR_RECURSIVE_ENTITY_REF |
| 13 | XML_ERROR_ASYNC_ENTITY |
| 14 | XML_ERROR_BAD_CHAR_REF |
| 15 | XML_ERROR_BINARY_ENTITY_REF |
| 16 | XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF |
| 17 | XML_ERROR_MISPLACED_XML_PI |
| 18 | XML_ERROR_UNKNOWN_ENCODING |
| 19 | XML_ERROR_INCORRECT_ENCODING |
| 20 | XML_ERROR_UNCLOSED_CDATA_SECTION |
| 21 | XML_ERROR_EXTERNAL_ENTITY_HANDLING |
| 22 | XML_ERROR_NOT_STANDALONE |
| 23 | XML_ERROR_UNEXPECTED_STATE |
| 24 | XML_ERROR_ENTITY_DECLARED_IN_PE |
| 25 | XML_ERROR_FEATURE_REQUIRES_XML_DTD |
| 26 | XML_ERROR_CANT_CHANGE_FEATURE_ONCE_PARSING |
Notes
You will likely use the StartElement event handler to do most of your processing.
XMLReader can be used to parse an XML document instead of using the XMLDocument class. In most cases you will want to use XMLDocument as it is simpler, but XMLReader can be useful for more advanced situtuations:
- Large XML documents that would take too much memory to load with XMLDocument
- Where you only need to parse out a subset of the XML and do not need to load the entire document
- Situations where you want to convert the XML to another format on the fly
To use XMLReader, create a subclass and implement the event handlers.
See Also
XMLReaderException class.