XML Component
Properties Methods Events Config Settings Errors
The XML component can be used to both parse and create XML documents.
Syntax
IPWorks.Xml
Remarks
The XML component can operate as either a parser or writer of XML.
Parsing XML
The XML component parses XML documents and verifies that they are well-formed. The results are provided through a set of events complying with the SAX2 specification.
In addition, the document structure may be queried through an XPath mechanism that supports a subset of the XPath specification.
The parser is optimized for read applications, with a very fast engine that builds internal DOM structures with close to zero heap allocations. Additionally, BuildDOM can be set to False which reduces the overhead of creating the DOM and offers a fast forward-only parsing implementation which fires events to provide the parsed data.
When parsing a document events will fire to provide information about the parsed data. After Parse returns the document may be navigated by setting XPath if BuildDOM is True (default). If BuildDOM is False parsed data is only accessible through the events.
Events are fired only when qualifying conditions (such as, for example, the beginning of a new element) are met. In the meantime, text will be buffered internally. The following events will fire during parsing:
- Characters
- Comment
- EndElement
- EndPrefixMapping
- EvalEntity
- IgnorableWhitespace
- Meta
- PI
- SpecialSection
- StartElement
- StartPrefixMapping
If BuildDOM is True (default), XPath may be set after this method returns. XPath implements a subset of the XML XPath specification, allowing you to point to specific elements in the XML documents.
The path is a series of one or more element accessors separated by '/'. The path can be absolute (starting with '/') or relative to the current XPath location.
The following are possible values for an element accessor:
'name' | A particular element name |
name[i] | The i-th subelement of the current element with the given name |
[i] | The i-th subelement of the current element |
[last()] | The last subelement of the current element |
[last()-i] | The subelement located at the last location minus i in the current element |
name[@attrname="attrvalue"] | The subelement containing a particular value for a given attribute (supports single AND double quotes) |
.. | The parent of the current element |
BuildDOM must be set to True prior to parsing the document for the XPath functionality to be available.
Example (Setting XPath):
Document root | XML.XPath = "/" |
Specific Element | XML.XPath = "/root/SubElement1/SubElement2/" |
i-th Child | XML.XPath = "/root/SubElement1[i]" |
Input Properties
The component will determine the source of the input based on which properties are set.
The order in which the input properties are checked is as follows:
When a valid source is found, the search stops.If parsing multiple documents call Reset between documents to reset the parser.
An additional "relaxed" mode allows for lexical parsing of non-XML documents (e.g. HTML). This is enabled by setting Validate to False. In this case, events will be fired as elements, entities, etc. are encountered, but the structure of the document will not be checked for "well-formedness", and the internal DOM structure will not be built.
Writing XML
To use the component first decide whether or not to write to file, a stream, or to OutputData.
Output Properties
The component will determine the destination of the output based on which properties are set.
The order in which the output properties are checked is as follows:
- SetOutputStream
- OutputFile
- OutputData: The output data are written to this property if no other destination is specified.
To begin writing the XML document first optionally set XMLDeclaration. If this is not set the component will use a default XML declaration at the beginning of the document.
Next begin adding elements to your document. Calling StartElement will open an element with the specified name. To create a nested structure continue calling StartElement to open more child elements. To write a value within an element call PutString. To close the element that was last opened call EndElement. Each time EndElement is called the element at the current level is closed. Alternatively, calling PutElement will write the element specified with the value specified and will also close the element.
To write an attribute of the current element, after calling StartElement call PutAttr. Call PutAttr multiple times to add multiple attributes.
Writing comments or CDATA can be done at any time with the PutComment and PutCData methods.
To close your XML document call Save. You can call Save from any location and it will close any remaining open elements automatically.
Property List
The following is the full list of the properties of the component with short descriptions. Click on the links for further details.
BuildDOM | When True, an internal object model of the XML document is created. |
InputData | The XML data to parse. |
InputFile | The file to process. |
Namespaces | Collection of namespaces in the current namespace stack. |
OutputData | The output XML after processing. |
OutputFile | The path to a local file where the output will be written. |
Overwrite | Indicates whether or not the component should overwrite files. |
Validate | This property controls whether documents are validated during parsing. |
XAttributes | A collection of attributes of the current element. |
XChildren | Collection of child elements of the currently selected XML element. |
XComments | A collection of comments of the current element. |
XElement | The name of the current element. |
XMLDeclaration | Specifies details of the XML declaration. |
XNamespace | The namespace of the current element. |
XParent | The parent of the current element. |
XPath | Provides a way to point to a specific element in the document. |
XPrefix | The prefix of the current element. |
XSubTree | A snapshot of the current element in the document. |
XText | The text of the current element. |
Method List
The following is the full list of the methods of the component with short descriptions. Click on the links for further details.
config | Sets or retrieves a configuration setting. |
endElement | Writes the closing tag of an open XML element. |
flush | Flushes the parser and checks its end state. |
getAttr | Returns the value of the specified attribute. |
hasXPath | Determines whether a specific element exists in the document. |
loadDOM | Loads the DOM from a file. |
loadSchema | Load the XML schema. |
parse | This method parses the specified XML data. |
putAttr | Writes an XML attribute. |
putCData | Writes an XML CDATA block. |
putComment | Writes an XML comment block. |
putElement | Writes a simple XML element with a value. |
putRaw | Writes a raw XML fragment. |
putString | Writes text inside an XML element. |
removeAttr | Remove a attribute. |
removeChildren | Removes the children of the elment as the specified XPath. |
removeElement | Removes the elment as the specified XPath. |
reset | Resets the parser. |
save | Closes the component writing stream. |
saveDOM | Saves the DOM to a file. |
setInputStream | Sets the stream from which the component will read data to parse. |
setOutputStream | The stream to which the component will write the XML. |
startElement | Writes the opening tag of an XML element. |
tryXPath | Navigates to the specified XPath if it exists. |
Event List
The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.
Characters | Fired for plain text segments of the input stream. |
Comment | Fired when a comment section is encountered. |
EndElement | Fired when an end-element tag is encountered. |
EndPrefixMapping | Fired when leaving the scope of a namespace declaration. |
Error | Fired when information is available about errors during data delivery. |
EvalEntity | Fired every time an entity needs to be evaluated. |
IgnorableWhitespace | Fired when a section of ignorable whitespace is encountered. |
Meta | Fired when a meta section is encountered. |
PI | Fired when a processing instruction section is encountered. |
SpecialSection | Fired when a special section is encountered. |
StartElement | Fired when a begin-element tag is encountered in the document. |
StartPrefixMapping | Fired when entering the scope of a namespace declaration. |
XML | Fires as XML is written. |
Config Settings
The following is a list of config settings for the component with short descriptions. Click on the links for further details.
CacheContent | If true, the original XML is saved in a buffer. |
Charset | Specifies the charset used when encoding data. |
CloseInputStreamAfterProcess | Determines whether or not the input stream is closed after processing. |
CloseOutputStreamAfterProcess | Determines whether or not the output stream is closed after processing. |
EOL | The characters to use for separating lines. |
ErrorOnEmptyAttr | If true, passing an invalid attribute to the Attr method will throw an exception. |
ExtraNameChars | Extra characters for the parser to consider as name characters. |
ExtraSpaceChars | Extra characters for the parser to consider as white space. |
FlushOnEOL | If set, the parser flushes its text buffer after every line of text. |
IgnoreBadAttributePrefixes | If true, bad (unknown) attribute prefixes are ignored. |
IgnoreBadElementPrefixes | If true, bad (unknown) element prefixes are ignored. |
IncludeElementPrefix | Whether to include the prefix in the element name. |
IncludeXMLDeclaration | Whether to include the XML declaration when writing XML. |
Indent | The characters to use for each indentation level. |
Offset | Current offset of the document being parsed. |
PreserveWhitespace | If true, leading and trailing whitespace in element text is preserved. |
QuoteChar | Quote character to use for attribute values. |
StringProcessingOptions | Defines options to use when processing string values. |
BuildInfo | Information about the product's build. |
GUIAvailable | Whether or not a message loop is available for processing events. |
LicenseInfo | Information about the current license. |
MaskSensitive | Whether sensitive data is masked in log messages. |
UseDaemonThreads | Whether threads created by the component are daemon threads. |
UseInternalSecurityAPI | Whether or not to use the system security libraries or an internal implementation. |
BuildDOM Property (XML Component)
When True, an internal object model of the XML document is created.
Syntax
public boolean isBuildDOM(); public void setBuildDOM(boolean buildDOM);
Default Value
True
Remarks
Set BuildDOM to True when you need to browse the current document through XPath.
Validate is automatically set to True when BuildDOM is set to True.
InputData Property (XML Component)
The XML data to parse.
Syntax
public String getInputData(); public void setInputData(String inputData);
Default Value
""
Remarks
This property specifies the XML to be processed. Set this property before calling Parse.
This may be set to a complete XML document, or partial data. When setting partial data call Parse after each chunk of data is set. For instance:
//Parse the following in chunks: <test>1</test>
xml.InputData = "<test>"
xml.Parse();
xml.InputData = "1<test>"
xml.Parse();
Input Properties
The component will determine the source of the input based on which properties are set.
The order in which the input properties are checked is as follows:
- SetInputStream
- InputFile
- InputData
InputFile Property (XML Component)
The file to process.
Syntax
public String getInputFile(); public void setInputFile(String inputFile);
Default Value
""
Remarks
This property specifies the file to be processed. Set this property to the full or relative path to the file which will be processed.
After setting this property call Parse to parse the document.
Input Properties
The component will determine the source of the input based on which properties are set.
The order in which the input properties are checked is as follows:
- SetInputStream
- InputFile
- InputData
Namespaces Property (XML Component)
Collection of namespaces in the current namespace stack.
Syntax
public XMLNamespaceList getNamespaces(); public void setNamespaces(XMLNamespaceList namespaces);
Remarks
This property contains a collection of XML namespaces, which are standards for providing uniquely named elements and attributes in an XML instance.
This collection is indexed from 0 to size -1.
This property is not available at design time.
Please refer to the XMLNamespace type for a complete list of fields.OutputData Property (XML Component)
The output XML after processing.
Syntax
public String getOutputData(); public void setOutputData(String outputData);
Default Value
""
Remarks
This property will be populated with the output from the operation if OutputFile and SetOutputStream are not set.
OutputFile Property (XML Component)
The path to a local file where the output will be written.
Syntax
public String getOutputFile(); public void setOutputFile(String outputFile);
Default Value
""
Remarks
This property specifies the file to which the output will be written. This may be set to an absolute or relative path.
Output Properties
The component will determine the destination of the output based on which properties are set.
The order in which the output properties are checked is as follows:
- SetOutputStream
- OutputFile
- OutputData: The output data are written to this property if no other destination is specified.
Overwrite Property (XML Component)
Indicates whether or not the component should overwrite files.
Syntax
public boolean isOverwrite(); public void setOverwrite(boolean overwrite);
Default Value
False
Remarks
This property indicates whether or not the component will overwrite OutputFile. If Overwrite is False, an error will be thrown whenever OutputFile exists before an operation. The default value is False.
Validate Property (XML Component)
This property controls whether documents are validated during parsing.
Syntax
public boolean isValidate(); public void setValidate(boolean validate);
Default Value
True
Remarks
When true (default) the document will be validated during parsing. To disable validation set Validate to false. Disabling validation may be useful in cases where data can still be parsed even if the document is not well-formed.
XAttributes Property (XML Component)
A collection of attributes of the current element.
Syntax
public XMLAttributeList getXAttributes(); public void setXAttributes(XMLAttributeList XAttributes);
Remarks
This collection consists of all attributes of the current XML element. The component parses each attribute into a collection of XMLAttribute types.
This collection is indexed from 0 to size -1.
This property is not available at design time.
Please refer to the XMLAttribute type for a complete list of fields.XChildren Property (XML Component)
Collection of child elements of the currently selected XML element.
Syntax
public XMLElementList getXChildren(); public void setXChildren(XMLElementList XChildren);
Remarks
This property contains a collection of child elements of the currently selected XML element. The elements are provided in the collection in the same order they are found in the XML document.
This collection is indexed from 0 to size -1.
This property is not available at design time.
Please refer to the XMLElement type for a complete list of fields.XComments Property (XML Component)
A collection of comments of the current element.
Syntax
public XMLCommentList getXComments(); public void setXComments(XMLCommentList XComments);
Remarks
This collection consists of all comments of the element at the current XPath. The component parses each comment into a collection of XMLComment types.
This collection is indexed from 0 to size -1.
This functionality is not yet implemented.
This property is not available at design time.
Please refer to the XMLComment type for a complete list of fields.XElement Property (XML Component)
The name of the current element.
Syntax
public String getXElement(); public void setXElement(String XElement);
Default Value
""
Remarks
The current element is specified via the XPath property.
XMLDeclaration Property (XML Component)
Specifies details of the XML declaration.
Syntax
public XMLDeclaration getXMLDeclaration(); public void setXMLDeclaration(XMLDeclaration XMLDeclaration);
Remarks
This property holds details of the XML declaration for the document being written.
This is only applicable when writing XML.
Please refer to the XMLDeclaration type for a complete list of fields.XNamespace Property (XML Component)
The namespace of the current element.
Syntax
public String getXNamespace(); public void setXNamespace(String XNamespace);
Default Value
""
Remarks
The current element is specified via the XPath property.
XParent Property (XML Component)
The parent of the current element.
Syntax
public String getXParent();
Default Value
""
Remarks
The current element is specified via the XPath property.
This property is read-only.
XPath Property (XML Component)
Provides a way to point to a specific element in the document.
Syntax
public String getXPath(); public void setXPath(String XPath);
Default Value
""
Remarks
XPath implements a subset of the XML XPath specification, allowing you to point to specific elements in the XML documents.
The path is a series of one or more element accessors separated by '/'. The path can be absolute (starting with '/') or relative to the current XPath location.
The following are possible values for an element accessor:
'name' | A particular element name |
name[i] | The i-th subelement of the current element with the given name |
[i] | The i-th subelement of the current element |
[last()] | The last subelement of the current element |
[last()-i] | The subelement located at the last location minus i in the current element |
name[@attrname="attrvalue"] | The subelement containing a particular value for a given attribute (supports single AND double quotes) |
.. | The parent of the current element |
BuildDOM must be set to True prior to parsing the document for the XPath functionality to be available.
Example (Setting XPath):
Document root | XML.XPath = "/" |
Specific Element | XML.XPath = "/root/SubElement1/SubElement2/" |
i-th Child | XML.XPath = "/root/SubElement1[i]" |
XPrefix Property (XML Component)
The prefix of the current element.
Syntax
public String getXPrefix(); public void setXPrefix(String XPrefix);
Default Value
""
Remarks
The current element is specified via the XPath property.
XSubTree Property (XML Component)
A snapshot of the current element in the document.
Syntax
public String getXSubTree();
Default Value
""
Remarks
The current element is specified via the XPath property. In order for this property to work you must have the CacheContent set to true.
This property is read-only.
XText Property (XML Component)
The text of the current element.
Syntax
public String getXText(); public void setXText(String XText);
Default Value
""
Remarks
The current element is specified via the XPath property.
Config Method (Xml Component)
Sets or retrieves a configuration setting.
Syntax
public String config(String configurationString);
Remarks
Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.
These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.
To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).
To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.
EndElement Method (Xml Component)
Writes the closing tag of an open XML element.
Syntax
public void endElement();
Remarks
Writes the closing tag of the XML element most recently opened using StartElement.
If no elements are opened, the call throws an exception
Flush Method (Xml Component)
Flushes the parser and checks its end state.
Syntax
public void flush();
Remarks
When Flush is called, the parser flushes all its buffers, firing events as necessary, and then checks its end state. If Validate is true, the parser verifies that all open elements were closed, returning an error if not.
GetAttr Method (Xml Component)
Returns the value of the specified attribute.
Syntax
public String getAttr(String attrName);
Remarks
This method returns the value of the attribute specified by the AttrName parameter.
If the attribute does not exist an empty string is returned. The behavior when an attribute does not exit is controlled by ErrorOnEmptyAttr.
Please refer to the XAttributes collection for more information.
HasXPath Method (Xml Component)
Determines whether a specific element exists in the document.
Syntax
public boolean hasXPath(String XPath);
Remarks
This method determines whether a particular XPath exists within the document. This may be used to check if a path exists before setting it via XPath.
This method returns True if the xpath exists, False if not.
See XPath for details on the XPath syntax.
LoadDOM Method (Xml Component)
Loads the DOM from a file.
Syntax
public void loadDOM(String fileName);
Remarks
The LoadDOM method loads a DOM structure previously saved by SaveDOM from the file specified in FileName.
Please refer to the SaveDOM method for more information.
LoadSchema Method (Xml Component)
Load the XML schema.
Syntax
public void loadSchema(String schema);
Remarks
This functionality is not yet implemented.
This method loads the schema specified in the Schema parameter. The Schema may be specified as either a string or the path to a file on disk.
The component will validate the input data during parsing to verify it adheres to the schema.
Parse Method (Xml Component)
This method parses the specified XML data.
Syntax
public void parse();
Remarks
This method parses the specified XML data.
When parsing a document events will fire to provide information about the parsed data. After Parse returns the document may be navigated by setting XPath if BuildDOM is True (default). If BuildDOM is False parsed data is only accessible through the events.
Events are fired only when qualifying conditions (such as, for example, the beginning of a new element) are met. In the meantime, text will be buffered internally. The following events will fire during parsing:
- Characters
- Comment
- EndElement
- EndPrefixMapping
- EvalEntity
- IgnorableWhitespace
- Meta
- PI
- SpecialSection
- StartElement
- StartPrefixMapping
If BuildDOM is True (default), XPath may be set after this method returns. XPath implements a subset of the XML XPath specification, allowing you to point to specific elements in the XML documents.
The path is a series of one or more element accessors separated by '/'. The path can be absolute (starting with '/') or relative to the current XPath location.
The following are possible values for an element accessor:
'name' | A particular element name |
name[i] | The i-th subelement of the current element with the given name |
[i] | The i-th subelement of the current element |
[last()] | The last subelement of the current element |
[last()-i] | The subelement located at the last location minus i in the current element |
name[@attrname="attrvalue"] | The subelement containing a particular value for a given attribute (supports single AND double quotes) |
.. | The parent of the current element |
BuildDOM must be set to True prior to parsing the document for the XPath functionality to be available.
Example (Setting XPath):
Document root | XML.XPath = "/" |
Specific Element | XML.XPath = "/root/SubElement1/SubElement2/" |
i-th Child | XML.XPath = "/root/SubElement1[i]" |
Input Properties
The component will determine the source of the input based on which properties are set.
The order in which the input properties are checked is as follows:
When a valid source is found, the search stops.If parsing multiple documents call Reset between documents to reset the parser.
PutAttr Method (Xml Component)
Writes an XML attribute.
Syntax
public void putAttr(String name, String namespaceURI, String value);
Remarks
Writes an XML attribute on the currently opened XML element. It must be called right after calling StartElement and before any calls to PutString, PutComment or PutRaw.
If Name is a local name without a prefix, the component will automatically introduce a new xmlns="NamespaceURI" attribute if necessary.
If Name is in the form prefix:local, then component will automatically introduce a new xmlns:prefix="NamespaceURI" as necessary.
Certain attribute names will be handled in special ways by this method. If Name is "xmlns" or uses the "xmlns" prefix, the attribute will be interpreted as a namespace declaration, regardless of the value of NamespaceURI. Similarly, any attribute using the "xml" prefix will be interpreted as a special attribute (like "xml:lang") and NamespaceURI will be ignored.
PutCData Method (Xml Component)
Writes an XML CDATA block.
Syntax
public void putCData(String text);
Remarks
Writes a new XML CDATA block with the specified text inside the current element.
PutComment Method (Xml Component)
Writes an XML comment block.
Syntax
public void putComment(String text);
Remarks
Writes a new XML comment block with the specified text.
PutElement Method (Xml Component)
Writes a simple XML element with a value.
Syntax
public void putElement(String name, String namespaceURI, String value);
Remarks
Writes a simple XML element with no attributes and the specified value between the opening and closing tags.
If Name is a local name without a prefix, the component will automatically introduce a new xmlns="NamespaceURI" attribute if necessary.
If Name is in the form prefix:local, then component will automatically introduce a new xmlns:prefix="NamespaceURI" as necessary.
When calling PutElement or StartElement, if a NamespaceURI is not specified an empty namespace will be defined for the element. If a namespace should be associated with the element, a NamespaceURI value must be provided. When creating the XML, the component will determine if the namespace already exists to avoid duplicate definitions of the same namespace. For example, to create this XML:
<book xmlns='urn:loc.gov:books' xmlns:isbn='urn:ISBN:0-395-36341-6'> <title>Cheaper by the Dozen</title> <isbn:number>1568491379</isbn:number> </book>Use the code:
xml.StartElement("book", "urn:loc.gov:books");
xml.PutAttr("xmlns:isbn", "", "urn:ISBN:0-395-36341-6");
xml.PutElement("title", "urn:loc.gov:books", "Cheaper by the Dozen");
xml.PutElement("isbn:number", "urn:ISBN:0-395-36341-6", "1568491379");
xmlw.Close();
In the above example the "title" element uses the default namespace "urn:loc.gov:books" and the "number"
element uses the "urn:ISBN:0-395-36341-6" namespace as defined for the "isbn" prefix.
PutRaw Method (Xml Component)
Writes a raw XML fragment.
Syntax
public void putRaw(String text);
Remarks
Writes a raw XML fragment to the output, without escaping and without verification. If an XML element opening tag has been written, before the raw fragment, the fragment will be written as a child of the current element.
Use of this method should be carefully considered as it can easily lead to malformed XML content.
PutString Method (Xml Component)
Writes text inside an XML element.
Syntax
public void putString(String text);
Remarks
This method will XML escape the value provided and write the resulting escaped text between the opening and closing tags of an XML element.
RemoveAttr Method (Xml Component)
Remove a attribute.
Syntax
public void removeAttr(String attrName);
Remarks
This method removes an attribute at the specified XPath
This functionality is not yet implemented.
RemoveChildren Method (Xml Component)
Removes the children of the elment as the specified XPath.
Syntax
public void removeChildren();
Remarks
This method removes the children of the element specified by XPath.
When called the component will remove the children of the element from the internal representation of the XML (the DOM). The element itself remains, with no children. This may be used at any time after Parse returns, or from within the EndElement event as a document is parsed in order to remove sections of a document that will not be needed later. By removing unnecessary elements from the DOM memory consumption is reduced and overall performance is improved.
RemoveChildren Example:
Given the XML
<food> <fruits> <apple> <color>red</color> </apple> <banana> <color>yellow</color> </banana> </fruits> </food>
This code removes the children of the apple element while leaving the apple element in place.
xml.XPath = "/food/fruits/apple";
xml.RemoveChildren();
The XML stored in the DOM is now:
<food> <fruits> <apple> </apple> <banana> <color>yellow</color> </banana> </fruits> </food>
RemoveElement Method (Xml Component)
Removes the elment as the specified XPath.
Syntax
public void removeElement();
Remarks
This method removes the element specified by XPath.
When called the component will remove the element and its children from the internal representation of the XML (the DOM). This may be used at any time after Parse returns, or from within the EndElement event as a document is parsed in order to remove sections of a document that will not be needed later. By removing unnecessary elements from the DOM memory consumption is reduced and overall performance is improved.
RemoveElement Example:
Given the XML
<food> <fruits> <apple> <color>red</color> </apple> <banana> <color>yellow</color> </banana> </fruits> </food>
This code removes the apple element and its children.
xml.XPath = "/food/fruits/apple";
xml.RemoveElement();
The XML stored in the DOM is now:
<food> <fruits> <banana> <color>yellow</color> </banana> </fruits> </food>
Reset Method (Xml Component)
Resets the parser.
Syntax
public void reset();
Remarks
When called, the parser flushes all its buffers, firing events as necessary, and then initializes itself to its default state.
Reset must also be used as signal to the parser that the current stream of text has terminated.
Save Method (Xml Component)
Closes the component writing stream.
Syntax
public void save();
Remarks
This method will close any open XML elements, and then close the OutputFile or output stream if necessary.
SaveDOM Method (Xml Component)
Saves the DOM to a file.
Syntax
public void saveDOM(String fileName);
Remarks
The SaveDOM method saves the current DOM structure to the file specified in FileName. This enables the component to later load the DOM without incurring any parsing overhead.
Please refer to the LoadDOM method for more information.
SetInputStream Method (Xml Component)
Sets the stream from which the component will read data to parse.
Syntax
public void setInputStream(java.io.InputStream inputStream);
Remarks
This method specifies a stream from which data will be read when Parse is called.
Input Properties
The component will determine the source of the input based on which properties are set.
The order in which the input properties are checked is as follows:
When a valid source is found, the search stops.SetOutputStream Method (Xml Component)
The stream to which the component will write the XML.
Syntax
public void setOutputStream(java.io.OutputStream outputStream);
Remarks
This method sets the stream to which output will be written when writing data.
Output Properties
The component will determine the destination of the output based on which properties are set.
The order in which the output properties are checked is as follows:
- SetOutputStream
- OutputFile
- OutputData: The output data are written to this property if no other destination is specified.
StartElement Method (Xml Component)
Writes the opening tag of an XML element.
Syntax
public void startElement(String name, String namespaceURI);
Remarks
Writes the opening tag of a new XML element. If an XML element is already opened, then this element is written as a child.
If Name is a local name without a prefix, the component will automatically introduce a new xmlns="NamespaceURI" attribute if necessary.
If Name is in the form prefix:local, then component will automatically introduce a new xmlns:prefix="NamespaceURI" as necessary.
When calling PutElement or StartElement, if a NamespaceURI is not specified an empty namespace will be defined for the element. If a namespace should be associated with the element, a NamespaceURI value must be provided. When creating the XML, the component will determine if the namespace already exists to avoid duplicate definitions of the same namespace. For example, to create this XML:
<book xmlns='urn:loc.gov:books' xmlns:isbn='urn:ISBN:0-395-36341-6'> <title>Cheaper by the Dozen</title> <isbn:number>1568491379</isbn:number> </book>Use the code:
xml.StartElement("book", "urn:loc.gov:books");
xml.PutAttr("xmlns:isbn", "", "urn:ISBN:0-395-36341-6");
xml.PutElement("title", "urn:loc.gov:books", "Cheaper by the Dozen");
xml.PutElement("isbn:number", "urn:ISBN:0-395-36341-6", "1568491379");
xmlw.Close();
In the above example the "title" element uses the default namespace "urn:loc.gov:books" and the "number"
element uses the "urn:ISBN:0-395-36341-6" namespace as defined for the "isbn" prefix.
TryXPath Method (Xml Component)
Navigates to the specified XPath if it exists.
Syntax
public boolean tryXPath(String xpath);
Remarks
This method will attempt to navigate to the specified XPath parameter if it exists within the document.
If the XPath exists the XPath property will be updated and this method returns True.
If the XPath does not exist the XPath property is not updated and this method returns False.
Characters Event (Xml Component)
Fired for plain text segments of the input stream.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void characters(XmlCharactersEvent e) {} ... } public class XmlCharactersEvent { public String text; }
Remarks
The Characters event provides the plain text content of the XML document (i.e. the text inside the tags). The text is provided through the Text parameter.
The text includes white space as well as end of line characters, except for ignorable whitespace which is fired through the IgnorableWhitespace event.
Comment Event (Xml Component)
Fired when a comment section is encountered.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void comment(XmlCommentEvent e) {} ... } public class XmlCommentEvent { public String text; }
Remarks
The Comment event is fired whenever a comment section (<!-- ..text... -->) is found in the document.
The full text of the comment is provided by the Text parameter.
EndElement Event (Xml Component)
Fired when an end-element tag is encountered.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void endElement(XmlEndElementEvent e) {} ... } public class XmlEndElementEvent { public String namespace; public String element; public String QName; public boolean isEmpty; }
Remarks
The EndElement event is fired when an end-element tag is found in the document.
The element name is provided by the Element parameter.
The IsEmpty parameter is true when the event corresponds with an empty element declaration.
EndPrefixMapping Event (Xml Component)
Fired when leaving the scope of a namespace declaration.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void endPrefixMapping(XmlEndPrefixMappingEvent e) {} ... } public class XmlEndPrefixMappingEvent { public String prefix; }
Remarks
The StartPrefixMapping event is fired when entering the scope of a namespace declaration.
Error Event (Xml Component)
Fired when information is available about errors during data delivery.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void error(XmlErrorEvent e) {} ... } public class XmlErrorEvent { public int errorCode; public String description; }
Remarks
The Error event is fired in case of exceptional conditions during message processing. Normally the component throws an exception.
The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.
EvalEntity Event (Xml Component)
Fired every time an entity needs to be evaluated.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void evalEntity(XmlEvalEntityEvent e) {} ... } public class XmlEvalEntityEvent { public String entity; public String value; }
Remarks
The Value parameter contains a suggested value for the entity (normally the entity name itself). You may set Value to a value of your choice, which will be later passed into the text stream.
IgnorableWhitespace Event (Xml Component)
Fired when a section of ignorable whitespace is encountered.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void ignorableWhitespace(XmlIgnorableWhitespaceEvent e) {} ... } public class XmlIgnorableWhitespaceEvent { public String text; }
Remarks
The ignorable whitespace section is provided by the Text parameter.
Meta Event (Xml Component)
Fired when a meta section is encountered.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void meta(XmlMetaEvent e) {} ... } public class XmlMetaEvent { public String text; }
Remarks
The Meta event is fired whenever a meta information section (<! ..text... >) is found in the document.
The full text of the meta section is provided by the Text parameter.
PI Event (Xml Component)
Fired when a processing instruction section is encountered.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void PI(XmlPIEvent e) {} ... } public class XmlPIEvent { public String text; }
Remarks
The PI event is fired whenever a processing instruction section (<? ..text... ?>) is found in the document.
The full text of the processing instruction is provided by the Text parameter.
SpecialSection Event (Xml Component)
Fired when a special section is encountered.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void specialSection(XmlSpecialSectionEvent e) {} ... } public class XmlSpecialSectionEvent { public String sectionId; public String text; }
Remarks
The SpecialSection event is fired whenever a special section (such as <![ CDATA [ ..text... ]]>) is found in the document.
The full text of the special section is provided by the Text parameter, while the SectionId parameter provides the section identifier (e.g. "CDATA").
StartElement Event (Xml Component)
Fired when a begin-element tag is encountered in the document.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void startElement(XmlStartElementEvent e) {} ... } public class XmlStartElementEvent { public String namespace; public String element; public String QName; public boolean isEmpty; }
Remarks
The StartElement event is fired when a begin-element tag is found in the document.
The element name is provided through the Element parameter. The attribute names and values (if any) are provided through the XAttributes collection.
The IsEmpty parameter is true when the event corresponds with an empty element declaration.
StartPrefixMapping Event (Xml Component)
Fired when entering the scope of a namespace declaration.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void startPrefixMapping(XmlStartPrefixMappingEvent e) {} ... } public class XmlStartPrefixMappingEvent { public String prefix; public String URI; }
Remarks
The EndPrefixMapping event is fired when leaving the scope of a namespace declaration.
XML Event (Xml Component)
Fires as XML is written.
Syntax
public class DefaultXmlEventListener implements XmlEventListener { ... public void XML(XmlXMLEvent e) {} ... } public class XmlXMLEvent { public String text; }
Remarks
This event fires when XML is output. The Text parameter holds the data being written.
This functionality is not yet implemented.
XMLAttribute Type
An XML attribute from the current XML element.
Remarks
This type describes an XML attribute from the current element. It includes fields to denote information about the attribute being defined.
Fields
Name
String (read-only)
Default Value: ""
The Name provides the local name (without prefix) of the attribute.
Namespace
String (read-only)
Default Value: ""
Attribute namespace.
Prefix
String (read-only)
Default Value: ""
Attribute prefix (if any). If the attribute does not have a prefix, this property is empty.
Value
String (read-only)
Default Value: ""
Attribute value.
Constructors
public XMLAttribute();
XMLComment Type
A comment within the document.
Remarks
This type holds a comment within the XML document.
Fields
Text
String
Default Value: ""
This field holds the comment text.
Constructors
public XMLComment();
public XMLComment( text);
XMLDeclaration Type
The XML declaration present at the beginning of a document.
Remarks
This type contains details about the XML declaration which may be set before writing a document. This is only applicable when writing documents.
Fields
Encoding
String
Default Value: "utf-8"
This field specifies the XML encoding to use.
This may be set before writing a document. The default value is "utf-8".
This is only applicable when writing XML.
Standalone
boolean
Default Value: True
This field indicates whether the standalone attribute is present in the declaration with a value of true.
This may be set before writing a document. The default value is "true".
This is only applicable when writing XML.
Version
String
Default Value: "1.0"
This field specifies the XML version.
This may be set before writing a document. The default value is "1.0".
This is only applicable when writing XML.
Constructors
public XMLDeclaration();
public XMLDeclaration( version, encoding, standalone);
XMLElement Type
An element contained within the XML document.
Remarks
This type describes an XML element. The fields for this type describe the element Name, Prefix, and Namespace of the given element.
The elements are inserted into the array in the same order they are found in the document.
Fields
Name
String (read-only)
Default Value: ""
The Name field provides the local name (without prefix) of the element.
Namespace
String (read-only)
Default Value: ""
Namespace of the element.
Prefix
String (read-only)
Default Value: ""
Prefix of the element (if any). If the element does not have a prefix, this property is empty.
XText
String (read-only)
Default Value: ""
The inner text of the element.
Constructors
public XMLElement();
XMLNamespace Type
An XML namespace from the current namespace stack.
Remarks
This type describes an XML namespace from the current stack. It includes fields to denote the Prefix and the URI of the namespace being defined.
The default namespace exists at index 0. The Prefix field at index 0 is "xmlns", and the Name field contains the default namespace.
Fields
Prefix
String
Default Value: ""
URI
String
Default Value: ""
Namespace URI associated with the corresponding Prefix. This is usually a URL pointing to the XML schema for the namespace.
Constructors
public XMLNamespace();
public XMLNamespace( name, prefix);
Config Settings (Xml Component)
The component accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.
XML Config Settings
This option should be combined with Indent for full effect.
If you would like any other characters to be considered as name characters, you may set them as a string into this property.
If you would like any other characters to be considered as white space, you may set them as a string into this property.
If False (default) and Validate is set to False the prefix is included in the Element parameter. For instance: ds:DigestMethod
If True and Validate is set to False the prefix is not included in the Element parameter. For instance: DigestMethod
This setting is only applicable when Validate is False.
<?xml version="1.0" encoding="utf-8" standalone="yes" ?> ...
This option should be combined with EOL for full effect.
Offset values start at 1.
Note: This only applies when BuildDOM is False.
By default no additional processing is performed and the string is returned as is from the document. Strings may also be XML unescaped. Possible values are:
0 (none - default) | No additional processing is performed. |
1 | Strings are XML unescaped. |
For instance, when set to 0 the following text may be fired through the Characters event:
&"<>
When set to 1 the following text would be fired through the Characters event:
&"<>
Base Config Settings
In some non-GUI applications, an invalid message loop may be discovered that will result in errant behavior. In these cases, setting GUIAvailable to false will ensure that the component does not attempt to process external events.
- Product: The product the license is for.
- Product Key: The key the license was generated from.
- License Source: Where the license was found (e.g., RuntimeLicense, License File).
- License Type: The type of license installed (e.g., Royalty Free, Single Server).
- Last Valid Build: The last valid build number for which the license will work.
This setting only works on these components: AS3Receiver, AS3Sender, Atom, Client(3DS), FTP, FTPServer, IMAP, OFTPClient, SSHClient, SCP, Server(3DS), Sexec, SFTP, SFTPServer, SSHServer, TCPClient, TCPServer.
Setting this configuration setting to true tells the component to use the internal implementation instead of using the system security libraries.
This setting is set to false by default on all platforms.
Trappable Errors (Xml Component)
XML Errors
101 Invalid attribute index. | |
102 No attributes available. | |
103 Invalid namespace index. | |
104 No namespaces available. | |
105 Invalid element index. | |
106 No elements available. | |
107 Attribute does not exist. | |
201 Unbalanced element tag. | |
202 Unknown element prefix (can't find namespace). | |
203 Unknown attribute prefix (can't find namespace). | |
204 Invalid XML markup. | |
205 Invalid end state for parser. | |
206 Document contains unbalanced elements. | |
207 Invalid XPath. | |
208 No such child. | |
209 Top element does not match start of path. | |
210 DOM tree unavailable (set BuildDOM to true and reparse). | |
302 Can't open file. | |
401 Invalid XML would be generated. | |
402 An invalid XML name has been specified. |