By Aiken, Allen
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Without solid and enforced nesting rules, this second document might be interpreted as a flight with no departure time that goes from one place named “559” to another place named “9:30”! As an illustration of how XML itself is a “meta-language,” consider how most of the time when new XML languages are created, the tags that are allowed in the document and the nesting rules that must be in place are themselves expressed in the XML document. The two major XML architectural components used to accomplish this are referred to as DTDs and XML Schemas.
Tag Pairs Can Be Nested Inside One Another at Multiple Levels The first rule, that tags always come in pairs, essentially acts to identify the XML concept of a piece of data. The second rule, that tags can be nested within one another, is what provides XML documents with their real structure. If one tag is nested within another, we can say that there is a “parent” tag (the outer tag) and a “child” tag (the inner tag). When this principle is applied to complex data structures, the result is an XML tree.
Data (home-grown database) Mfg. 9 Gordion knot of legacy application interconnections. XML Integration The solution to the issue of integrating many disparate data systems was frequently to develop one-time solutions to data interchange. The costs related to maintaining custom electronic data interchange (EDI) solutions were often underestimated, and organizations to this day are frequently plagued by inflexible, brittle software meant to perform these tasks. The essential problem with these systems as they have traditionally been designed is that the thinking that went into their architecture was essentially point to point.