xsd - XML Validation of DTD Elements -


hey guys i've got xml dtd code external when try , validate it, seem error. code have below:

<!doctype catalog [      <!element catalog (book)+>     <!element book (title, authors, year_published, isbn, number_of_pages, price) >     <!element title (#pcdata)>     <!element authors (author)>     <!element author (first_name, last_name, gender)>         <!element first_name (#pcdata)>         <!element last_name (#pcdata)>         <!element gender (#pcdata)>     <!element year_pusblished (#pcdata)>     <!element isbn (#pcdata)>     <!element number_of_pages (#pcdata)>     <!element price (discount)>         <!attlist price discount (yes|no) "no">]>

i know correct when validate error message comes up:

"markup declarations contained in or pointed document type declaration must well-formed. line 3 column 4"

i've checked can't seem working. guys able help?

you seem have used http://www.validome.org/xml/validate/ tool, issues exact error message in question , isn’t particularly helpful in other ways either. generally, quality of free xml validators is... varying. better tool http://xmlvalidator.new-studio.org.

if append following simple xml element , validate using better tool, better idea of problems:

<catalog> <book> <title></title> <authors> <author> <first_name></first_name> <last_name></last_name> <gender></gender> </author> </authors> <year_published></year_published> <isbn></isbn> <number_of_pages></number_of_pages> <price></price> </book> </catalog>

you following error messages:

line 25 column 17 : element type "year_published" must declared.

line 28 column 16 : content of element type "price" incomplete, must match "(discount)".

the first error easy: fix spelling year_pusblished (removing first s) in element declaration.

the second 1 less obvious, simple: have declared price element (discount) content model. mean price element must contain discount element , nothing more, , make no sense (though possible, formally speaking, need declare element discount). want allow character data content (the applicability of discount specified in discount attribute):

<!element price (#pcdata)>

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