xmerl_sax_parser - XML SAX parser API
A SAX parser for XML that sends the events through a callback
interface. SAX is the Simple API for XML, originally a Java-only API.
SAX was the first widely adopted API for XML in Java, and is a de
facto standard where there are versions for several programming language
environments other than Java.
- option():
- Options used to customize the behaviour of the parser. Possible options
are:
- {continuation_fun, ContinuationFun}:
- ContinuationFun is a call back function to decide what to do if the
parser runs into EOF before the document is complete.
- {continuation_state, term()}:
-
State that is accessible in the continuation call back function.
- {event_fun, EventFun}:
- EventFun is the call back function for parser events.
- {event_state, term()}:
-
State that is accessible in the event call back function.
- {file_type, FileType}:
-
Flag that tells the parser if it's parsing a DTD or a normal XML file
(default normal).
- *
- FileType = normal | dtd
- {encoding, Encoding}:
-
Set default character set used (default UTF-8). This character set is used
only if not explicitly given by the XML document.
- *
- Encoding = utf8 | {utf16,big} | {utf16,little} | latin1 | list
- skip_external_dtd:
-
Skips the external DTD during parsing.
- :
-
- event():
- The SAX events that are sent to the user via the callback.
- startDocument:
-
Receive notification of the beginning of a document. The SAX parser will
send this event only once before any other event callbacks.
- endDocument:
-
Receive notification of the end of a document. The SAX parser will send
this event only once, and it will be the last event during the parse.
- {startPrefixMapping, Prefix, Uri}:
-
Begin the scope of a prefix-URI Namespace mapping. Note that
start/endPrefixMapping events are not guaranteed to be properly nested
relative to each other: all startPrefixMapping events will occur
immediately before the corresponding startElement event, and all
endPrefixMapping events will occur immediately after the corresponding
endElement event, but their order is not otherwise guaranteed. There will
not be start/endPrefixMapping events for the "xml" prefix, since
it is predeclared and immutable.
- *
- Prefix = string()
- *
- Uri = string()
- {endPrefixMapping, Prefix}:
-
End the scope of a prefix-URI mapping.
- {startElement, Uri, LocalName, QualifiedName,
Attributes}:
-
Receive notification of the beginning of an element. The Parser will send
this event at the beginning of every element in the XML document; there
will be a corresponding endElement event for every startElement event
(even when the element is empty). All of the element's content will be
reported, in order, before the corresponding endElement event.
- *
- Uri = string()
- *
- LocalName = string()
- *
- QualifiedName = {Prefix, LocalName}
- *
- Prefix = string()
- *
- Attributes = [{Uri, Prefix, AttributeName, Value}]
- *
- AttributeName = string()
- *
- Value = string()
- {endElement, Uri, LocalName, QualifiedName}:
-
Receive notification of the end of an element. The SAX parser will send
this event at the end of every element in the XML document; there will be
a corresponding startElement event for every endElement event (even when
the element is empty).
- *
- Uri = string()
- *
- LocalName = string()
- *
- QualifiedName = {Prefix, LocalName}
- *
- Prefix = string()
- {characters, string()}:
-
Receive notification of character data.
- {ignorableWhitespace, string()}:
-
Receive notification of ignorable whitespace in element content.
- {processingInstruction, Target, Data}:
-
Receive notification of a processing instruction. The Parser will send this
event once for each processing instruction found: note that processing
instructions may occur before or after the main document element.
- *
- Target = string()
- *
- Data = string()
- {comment, string()}:
-
Report an XML comment anywhere in the document (both inside and outside of
the document element).
- startCDATA:
-
Report the start of a CDATA section. The contents of the CDATA section will
be reported through the regular characters event.
- endCDATA:
-
Report the end of a CDATA section.
- {startDTD, Name, PublicId, SystemId}:
-
Report the start of DTD declarations, it's reporting the start of the
DOCTYPE declaration. If the document has no DOCTYPE declaration, this
event will not be sent.
- *
- Name = string()
- *
- PublicId = string()
- *
- SystemId = string()
- endDTD:
-
Report the end of DTD declarations, it's reporting the end of the DOCTYPE
declaration.
- {startEntity, SysId}:
-
Report the beginning of some internal and external XML entities. ???
- {endEntity, SysId}:
-
Report the end of an entity. ???
- {elementDecl, Name, Model}:
-
Report an element type declaration. The content model will consist of the
string "EMPTY", the string "ANY", or a parenthesised
group, optionally followed by an occurrence indicator. The model will be
normalized so that all parameter entities are fully resolved and all
whitespace is removed,and will include the enclosing parentheses. Other
normalization (such as removing redundant parentheses or simplifying
occurrence indicators) is at the discretion of the parser.
- *
- Name = string()
- *
- Model = string()
- {attributeDecl, ElementName, AttributeName, Type, Mode,
Value}:
-
Report an attribute type declaration.
- *
- ElementName = string()
- *
- AttributeName = string()
- *
- Type = string()
- *
- Mode = string()
- *
- Value = string()
- {internalEntityDecl, Name, Value}:
-
Report an internal entity declaration.
- *
- Name = string()
- *
- Value = string()
- {externalEntityDecl, Name, PublicId, SystemId}:
-
Report a parsed external entity declaration.
- *
- Name = string()
- *
- PublicId = string()
- *
- SystemId = string()
- {unparsedEntityDecl, Name, PublicId, SystemId, Ndata}:
-
Receive notification of an unparsed entity declaration event.
- *
- Name = string()
- *
- PublicId = string()
- *
- SystemId = string()
- *
- Ndata = string()
- {notationDecl, Name, PublicId, SystemId}:
-
Receive notification of a notation declaration event.
- *
- Name = string()
- *
- PublicId = string()
- *
- SystemId = string()
- unicode_char():
-
Integer representing valid unicode codepoint.
- unicode_binary():
-
Binary with characters encoded in UTF-8 or UTF-16.
- latin1_binary():
-
Binary with characters encoded in iso-latin-1.
file(Filename, Options) -> Result
Types:
Filename = string()
Options = [option()]
Result = {ok, EventState, Rest} |
{Tag, Location, Reason, EndTags, EventState}
Rest = unicode_binary() | latin1_binary()
Tag = atom() (fatal_error, or user defined tag)
Location = {CurrentLocation, EntityName, LineNo}
CurrentLocation = string()
EntityName = string()
LineNo = integer()
EventState = term()
Reason = term()
Parse file containing an XML document. This functions uses a
default continuation function to read the file in blocks.
stream(Xml, Options) -> Result
Types:
Xml = unicode_binary() | latin1_binary() |
[unicode_char()]
Options = [option()]
Result = {ok, EventState, Rest} |
{Tag, Location, Reason, EndTags, EventState}
Rest = unicode_binary() | latin1_binary() | [unicode_char()]
Tag = atom() (fatal_error or user defined tag)
Location = {CurrentLocation, EntityName, LineNo}
CurrentLocation = string()
EntityName = string()
LineNo = integer()
EventState = term()
Reason = term()
Parse a stream containing an XML document.
The callback interface is based on that the user sends a fun with
the correct signature to the parser.
ContinuationFun(State) -> {NewBytes, NewState}
Types:
State = NewState = term()
NewBytes = binary() | list() (should be same as start input in stream/2)
This function is called whenever the parser runs out of input
data. If the function can't get hold of more input an empty list or binary
(depends on start input in stream/2) is returned. Other types of errors is
handled through exceptions. Use throw/1 to send the following tuple {Tag =
atom(), Reason = string()} if the continuation function encounters a fatal
error. Tag is an atom that identifies the functional entity that sends the
exception and Reason is a string that describes the problem.
EventFun(Event, Location, State) -> NewState
Types:
Event = event()
Location = {CurrentLocation, Entityname, LineNo}
CurrentLocation = string()
Entityname = string()
LineNo = integer()
State = NewState = term()
This function is called for every event sent by the parser. The
error handling is done through exceptions. Use throw/1 to send the following
tuple {Tag = atom(), Reason = string()} if the application encounters a
fatal error. Tag is an atom that identifies the functional entity that sends
the exception and Reason is a string that describes the problem.