4:Configuration Using XML
The device server provides an Extensible Markup Language (XML) interface that you can use to configure device server devices. Every configuration setting that can be issued from the device server Web Manager and CLI can be specified using XML.
The device server can import and export configuration settings as an XML document known as an XML Configuration Record (XCR). An XCR can be imported or exported via the CLI, a Web browser, FTP, or the device server filesystem. An XCR can contain many configuration settings or just a few. For example, it might change all of the configurable parameters for a device server, or it may only change the baud rate for a single serial line. Using XCRs is a straightforward and flexible way to manage the configuration of multiple device server devices.
XML Configuration Record Document Type Definition
An XML document type definition (DTD) is a description of the structure and content of an XML document. It verifies that a document is valid. XCRs are exported using the DTD as shown in Figure
Figure 4-1 DTD for XCRs
<!DOCTYPE configrecord [
<!ELEMENT configrecord (configgroup+)>
<!ELEMENT configgroup (configitem+,configgroup*)> <!ELEMENT configitem (value+)>
<!ELEMENT value (#PCDATA)>
<!ATTLIST configrecord version CDATA #IMPLIED> <!ATTLIST configgroup name CDATA #IMPLIED> <!ATTLIST configgroup instance CDATA #IMPLIED> <!ATTLIST configitem name CDATA #IMPLIED> <!ATTLIST value name CDATA #IMPLIED>
]>
The device server DTD rules state the following:
The XML document element is a <configrecord> element. This is the root element.
A <configrecord> must have one or more <configgroup> elements and can have a version attribute.
A <configgroup> must have one or more <configitem> elements and can have name and instance attributes.
A <configitem> element must have one or more <value> elements and can have a name attribute.
A <value> element can have only data and can have a name attribute.
The name attribute identifies a group, item, or value. It is always a quoted string.
The instance attribute identifies the specific option, like the serial port number. The "instance" attribute is always a quoted string.
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