SystemIdMap

java.lang.Object
- net.sf.saxon.tree.linked.SystemIdMap

```
public class SystemIdMap
extends java.lang.Object
```
System IDs are not held in nodes in the tree, because they are usually the same for a whole document.
This class provides a map from element sequence numbers to System IDs: it is linked to the root node of the tree.

Note that the System ID is not necessarily the same as the Base URI. The System ID relates to the external entity in which a node was physically located; this provides a default for the Base URI, but this may be modified by specifying an xml:base attribute.

The system IDs of nodes are assumed to be immutable; they can only be set sequentially, as the nodes are being created.

Constructor Summary

Constructors
Constructor Description

SystemIdMap()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`getSystemId(int sequence)`	Get the system ID corresponding to a given sequence number
`void`	`setSystemId(int sequence, java.lang.String uri)`	Set the system ID corresponding to a given sequence number

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SystemIdMap
```
public SystemIdMap()
```
- Method Detail
  - setSystemId
```
public void setSystemId(int sequence,
                        java.lang.String uri)
```
    Set the system ID corresponding to a given sequence number
    
    Parameters:
    
    sequence - the sequence number (position in document order) of the node whose system ID is to be set. This must be one greater that the previous system ID.
    
    uri - the system ID to be assigned at this sequence number
  - getSystemId
```
public java.lang.String getSystemId(int sequence)
```
    Get the system ID corresponding to a given sequence number
    
    Parameters:
    
    sequence - the sequence number
    
    Returns:
    
    the system ID