Abstract: Methods and apparatus for versioning an electronic document based on XML and methods and apparatus for providing an updated electronic document based on XML can use a version value. The electronic document being managed can use a syntax defining a structure of the structured electronic document. One method is characterized in that date information of when a content of the electronic document is changed is used as a version value.

Abstract: There is provided a method for requesting an electronic document based on XML in which the electronic document is created using a syntax defining a structure of a constructed electronic document. The electronic document request method can include creating a request document including an element name/attribute name based on a previously prescribed syntax without defining an additional syntax for requesting the electronic document, requesting a supply of the electronic document having an information on the element name/attribute name recorded in the request document, and receiving the electronic document including the information on the requested element name/attribute name.

Abstract: A digital processing phase lock loop for use in a synchronous micro-wave transmitter includes: a reference clock receiving unit for receiving an electric signal or an optical signal of 8 KHz as an reference clock from an external signal input unit or a switching unit; a phase comparator for comparing the reference clock output from the reference clock receiving unit with a self-clock feedback depending on a counter clock of 19.