Stands for “Document type declaration” A DTD states which tags may look within other labels, and tags and attributes used in HTML or XML document.

Document of kinds definitions used for huge XML databases can be thousands of lines long and can include many several data types. Providentially, DTDs can be easily modified in a text editor whenever changes need to be made.

Where each label is permitted. PRODUCT tags can’t include RECORD tags, although.


For Example, in a DTD you could state that LISTING tags may include PRODUCT tags. Where the DTD permits in certain publishers, when writers are typing data, they are able to spot labels.

Do you know ?

The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.