YAO 10A50 KNOWLEDGE BASE

Some problems were detected when running industry-standard test
suites.  They are described in this file.  Because of resource
constraints, it was not possible to analyze or repair them.  As no
support is currently committed for Project YAO software, please
discuss problems and solutions with fellow users on comp.text.sgml.

1. Incorrect severity in some messages.

Some messages contain an incorrect severity code.  For example, in

<!doctype a [
<!element a - - (b)>
<!element b - - (c)>
<!element b d NAME #CONREF>
<!element c - - (#PCDATA)>
]>
<a>
<b d="f">
</a>

the error message is

YSP0092: (E) Implied end-tag b was not declared omissible.

The "(E)" should have been "(I)".


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2. Errors in attribute values can cause RAST to crash.

Here are three examples:
2.1
   <!DOCTYPE i2u79301 [
   <!element i2u79301 - - (#PCDATA)>
   <!attlist i2u79301 i2u-a1 NUMBERS #REQUIRED>
   ]>
   <i2u79301 i2u-a1="name1 67890"></i2u79301>

In this case, the RAST is supposed to give an error message for the wrong
attribute value.  However, the RAST crashed instead.

2.2
   <!DOCTYPE i3c79313 [
   <!element i3c79313 - - (#PCDATA)>
   <!attlist i3c79313 i3c-a1 ENTITIES #REQUIRED>
   <!entity  i3c-e1 SDATA 'sdata1'>
   ]>
   <i3c79313 i3c-a1=^i3c-e1></i3c79313>

The RAST should give an error report on entities' value instead of crash.

2.3
   <!DOCTYPE i3c79313 [
   <!element i3c79313 - - (#PCDATA)>
   <!attlist i3c79313 i3c-a1 NUTOKENS #REQUIRED>
   ]>
   <i3c79313 i3c-a1=""></i3c79313>

The RAST should give an error report on the attribute's value instead of crash.


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3. There are difficulties in processing some content models. For
example:

3.1
<!DOCTYPE a [
<!element a - - (b)>
<!element b - - (#PCDATA, c, #PCDATA)>
<!element c - - (#PCDATA)>
]>
<a>
<b>data
<c>proper subelement</c>
data<b>
</a>

The test case is correct, but the RAST gives the following error report:
YSP0003: (I) In primary entity ("** No application info **), at line 3:
YSP0001: (I) <!element b - - (#PCDATA, c, #PCDATA)>
YSP0051: (T) inconsistent connector
YSP0007: (I) Terminated

Similar errors happen when the following content models are used:

3.2
<!element a - - (b|#PCDATA)*>

3.3
<!element a - - (b|c)*>