This is a short description of the DTD which defines the XML documents representing the help table used by the Value Constraint engine in the ClarkSystem. The table define the correspondence between tokens and short descriptions. When the constraint engine works and there is a choice among several tokens, the user can use this table to check runtime the meaning of each of them.

Note: In order to use a help table, the document containing it must be imported and saved in the system. Then it will appear in the choice box of the Value Constraint Editor for help file.

<!DOCTYPE CLaRK_constraints_help [
<!ELEMENT CLaRK_constraints_help (comment,pair+)>

Each such document is a sequence of several pairs (token-description). There is an additional comment element which is not processed by the system parser.

<!ELEMENT pair (item, descr)>

This element represent a single token-description pair. The content of each element of the pair have to obey the XML syntax.

<!ELEMENT item (#PCDATA)>
<!ELEMENT descr (#PCDATA)>
<!ELEMENT comment (#PCDATA)>
]>

Example help table:

<CLaRK_constraints_help>
<comment>Some comments</comment>
<pair><item>token1</item><descr>description 1</descr></pair>
<pair><item>token2</item><descr>description 2</descr></pair>
<pair><item>token3</item><descr>description 3</descr></pair>
<pair><item>token4</item><descr>description 4</descr></pair>
<pair><item>token5</item><descr>description 5</descr></pair>
<pair><item>token6</item><descr>description 6</descr></pair>
</CLaRK_constraints_help>