Export enables you to extract all or selected content from source XML files (see Configure Element Extraction for XML Documents). It detects the following XML formats:
generic XML
Microsoft Office 2003 XML (Word, Excel, and Visio)
StarOffice/OpenOffice XML (text document, presentation, and spreadsheet)
See File Format Detection for more information on format detection.
When you convert XML files, you can specify which elements and attributes are extracted according to the file’s format ID or root element. This is useful when you want to extract only relevant text elements, such as abstracts from reports, or a list of authors from an anthology.
A root element is an element in which all other elements are contained. In the XML sample below, book
is the root element:
<book> <title>XML Introduction</title> <product id="33-657" status="draft">XML Tutorial</product> <chapter>Introduction to XML <para>What is HTML</para> <para>What is XML</para> </chapter> <chapter>XML Syntax <para>Elements must have a closing tag</para> <para>Elements must be properly nested</para> </chapter> </book>
For example, you could specify that when converting files with the root element book
, the element title
is extracted as metadata, and only product
elements with a status
attribute value of draft
are extracted.
When you extract an element, the child elements within the element are also extracted. For example, if you extract the element chapter
from the sample above, the child element para
is also extracted.
Export defines default element extraction settings for the following XML formats:
generic XML
Microsoft Office 2003 XML (Word, Excel, and Visio)
StarOffice/OpenOffice XML (text document, presentation, and spreadsheet)
These settings are defined internally and are used when converting these file formats; however, you can modify their values.
In addition to the default extraction settings, you can also add custom settings for your own XML document types. If you do not define custom settings for your own XML document types, the settings for the generic XML are used.
You can modify configuration settings for XML documents through either the API or the kvxconfig.ini
file.
You can use the C API to modify the settings for the standard XML document types or add configuration settings for your own XML document types.
To modify settings
Call the fpInit()
function. See fpInit().
Define the KVXConfigInfo
structure. See KVXConfigInfo.
Call the KVXMLConfig()
function with the following arguments (see KVXMLConfig()):
Argument |
Parameter |
nType
|
KVCFG_SETXMLCONFIGINFO
|
nValue
|
0 |
pData
|
address of the KVXConfigInfo structure |
For example:
KVXConfigInfo xinfo; /* populate xinfo */ (*fpXMLConfig)(pKVXML,KVCFG_SETXMLCONFIGINFO
,0
, &xinfo);
Repeat steps 2 and 3 until the settings for all the XML document types you want to customize are defined.
Call the function fpConvertStream()
or KVXMLConvertFile()
. See fpConvertStream() or KVXMLConvertFile().
You can use the initialization file to modify the settings for the standard XML document types or add configuration settings for your own XML document types.
To modify settings
Use the template file when processing the XML file.
The sample program (xmlini
) demonstrates how to use a template file during the conversion process. See xmlini.
The kvxconfig.ini
file contains default element extraction settings for supported XML formats. The file is in the directory install
\
OS
\bin
, where install
is the path name of the Export installation directory and OS
is the name of the operating system. For example, the following entry defines extraction settings for the Microsoft Visio 2003 XML format:
[config3] eKVFormat=MS_Visio_XML_Fmt szRoot= szInMetaElement=DocumentProperties szExMetaElement=PreviewPicture szInContentElement=Text szExContentElement= szInAttribute=
The following options are available.
Configuration Option |
Description |
---|---|
eKVFormat
|
The format ID as detected by the KeyView detection module. This determines the file type to which these extraction settings apply. See File Format Detection for more information on format ID values. If you are adding configuration settings for a custom XML document type, this is not defined. |
szRoot
|
The file’s root element. When the format ID is not defined, the root element is used to determine the file type to which these settings apply. To further qualify the element, specify its namespace. See Specify an Element’s Namespace and Attribute. |
szInMetaElement
|
The elements extracted from the file as metadata. All other elements are extracted as text. Multiple entries must be separated by commas. To further qualify the element, specify its namespace, its attributes, or both. See Specify an Element’s Namespace and Attribute. |
szExMetaElement
|
The child elements in the included metadata elements that are not extracted from the file as metadata. For example, the default extraction settings for the Visio XML format extract the You cannot exclude any metadata elements from the output for StarOffice files. All metadata is extracted regardless of this setting. Multiple entries must be separated by commas. To further qualify the element, specify its namespace, its attributes, or both. See Specify an Element’s Namespace and Attribute. |
szInContentElement
|
The elements extracted from the file as content text. Enter an asterisk (*) to extract all elements including child elements. Multiple entries must be separated by commas. To further qualify the element, specify its namespace, its attributes, or both. See Specify an Element’s Namespace and Attribute. |
szExContentElement
|
The child elements in the included content elements that are not extracted from the file as content text. Multiple entries must be separated by commas. To further qualify the element, specify its namespace, its attributes, or both. See Specify an Element’s Namespace and Attribute. |
szInAttribute
|
The attribute values extracted from the file. If attributes are not defined here, attribute values are not extracted. Enter the namespace (if used), element name, and attribute name in the following format:
For example:
Multiple entries must be separated by commas. |
To further qualify an element, you can specify that the element must exist in a certain namespace, must contain a specific attribute, or both. To define the namespace and attribute of an element, enter the following:
ns_prefix
:
elemname
@
attribname
=
attribvalue
You must enclose attribute values that contain space in quotation marks.
For example, the following entry:
bg:
language@id=xml
extracts a language
element in the namespace bg
that contains the attribute name id
with the value of "xml"
. This entry extracts the following element from an XML file:
<bg:language id="xml">XML is a simple, flexible text format derived from SGML</bg:language>
but does not extract:
<bg:language id="sgml">SGML is a system for defining markup languages.</bg:language>
or
<adv:language id="xml">The namespace should be a Uniform Resource Identifier (URI).</adv:language>
You can define element extraction settings for custom XML document types by adding the settings to the kvxconfig.ini
file. For example, for files containing the root element keyviewxml
, you could add the following section to the end of the initialization file:
[config101] eKVFormat= szRoot=keyviewxml szInMetaElement=dc:title,dc:meta@title,dc:meta@name=title szExMetaElement= szInContentElement=keyview:division@name=dev,keyview:division@name=export,p@style="Heading 1" szExContentElement= szInAttribute=keyview:division@name
The custom extraction settings must be preceded by a section heading named [config
N
]
, where N
is an integer that starts at 100 and increases by 1 for each additional file type (for example, [config100]
, [config101]
, [config102]
, and so on). The default extraction settings for the supported XML formats are numbered config0
to config99
. Currently only 0
to 6
are used.
Because a custom XML document type is not recognized by the KeyView detection module, the format ID is not defined. The file type is identified by the file’s root element only.
If a custom XML document type is not defined in the kvxconfig.ini
file or by the KVXMLConfig()
function, the default extraction settings for a generic XML document are used.
|