DTD parsing errors

[kirill dorofeyev]

Hi, i have found two issues while trying to parse 4diac FB files:

1. Java DOM refuses to parse 4diac FBs xml files, throwing out “The markup declarations contained or pointed to by the document type declaration must be well-formed”. It looks like the problem is that http://www.holobloc.com/xml/LibraryElement.dtd file has <?xml version="1.0" encoding="UTF-8"?>  at its start, which it must not as, f.ex., stated here [1]. After I edit dtd locally, DOM is happy again. 

2. The same LibraryElement.dtd file contains the following definition of a FBTypeElement

<!ELEMENT FBType (Identification?,VersionInfo+,CompilerInfo?,InterfaceList,  (BasicFB | FBNetwork)?, Service?) > 

<!ATTLIST FBType

  Name CDATA #REQUIRED

  Comment CDATA #IMPLIED >

<!ELEMENT InterfaceList (EventInputs?,EventOutputs?,InputVars?,OutputVars?,  Sockets?, Plugs?)> 

<!ELEMENT EventInputs (Event+)> 

<!ELEMENT EventOutputs (Event+)> 

<!ELEMENT InputVars (VarDeclaration+)> 

<!ELEMENT OutputVars (VarDeclaration+)> 

<!ELEMENT Sockets (AdapterDeclaration+)> 

<!ELEMENT Plugs (AdapterDeclaration+)>

Should not all VarDeclarations and AdapterDeclarations have * instead of +? It'd be a valid FB for me.

[1] https://stackoverflow.com/questions/15588090/the-markup-declarations-contained-or-pointed-to-by-the-document-type-declaration

Thanks and best regards,

Kirill

[James Christensen]

1. The problem may be that LibraryElement.dtd is now on a secure server, which will automatically convert HTTP requests to HTTPS responses, i.e., http://www.holobloc.com/xml/LibraryElement.dtd returns https://www.holobloc.com/xml/LibraryElement.dtd. This may be a problem with 4DIAC XML files, but is not a problem with FBDK XML files, which have all been updated to the secure server. Or perhaps the Java DOM parser (javax.xml.parsers.DocumentBuilder?) dislikes HTTP transfer. BTW, your reference does not say that the <?xml version="1.0" encoding="UTF-8"?> header is forbidden, just that the inquirer had misspelled "apache".

2. The case of zero elements in a sublist of InterfaceList is covered by the syntax that all sublists are optional, e.g., "EventInputs?" means zero or one "EventInputs" list.

--
Best regards,
Jim Christensen

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[kirill dorofeyev]

Hi Jim,

thanks for the feedback.

1. the answer on stackoverflow says there are two issues -- first, misspelled apache, and, second, "The DTD available at http://struts.apache.org/dtds/struts-2.0.dtd starts with an XML declaration (<?xml version="1.0" encoding="UTF-8"?>), which is forbidden at the beginning of a DTD (because a DTD is not an XML file)."

Java gets the file correctly: I reproduce the same behavior when i download LibraryElement.dpd and run it locally. When I delete the <?xml version="1.0" encoding="UTF-8"?>, it works like a charm.

2. Makes sense. I'll re-check why I'm getting an error there.

Best regards,

Kirill

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