[basex-talk] Question about Staircase Join

[Yasir B]

Hello,

I am studying the paper "Storing and Querying Large XML Instances".
[https://files.basex.org/publications/Gruen%20%5B2010%5D,%20Storing%20and%20Querying%20Large%20XML%20Instances.pdf]

This is very interesting and helpful to read!  I apologize I fail to
understand the following in 3.4.2.1 Staircase Join:

"In the partitioned plane, the scanned areas are made disjunct, i.e.,
scanning is canceled whenever the pre value of the currently scanned
node equals the pre value of the next context node."

Since pre values are unique (?), I couldn't follow how the next
context node would have the same pre value.  For the partitioning
step, I had the impression the next context node is not the same as
the current context node, nor would it be a descendant of the current
context node.

Thank you,
Yasir

[basex-talk] unknown type error returned for xs:anySimpleType and xs:anyType

[Yasir B]

Hello,

I ran the following query using BaseX 9.3.3 command-line client:
'hello' instance of xs:anyAtomicType
the result of the query is `true`.

But if I run this query:
'hello' instance of xs:anySimpleType
an error "[XPST0051] Unknown type: xs:anySimpleType" is returned

Similarly, for the query:
'hello' instance of xs:anyType
an error "[XPST0051] Unknown type: xs:anyType" is returned

Should xs:anySimpleType and xs:anyType be recognized?

Thank you,
Yasir