如何通过XML和XSD制作几何拓扑

Question

我需要找到使用拓扑表示定义线的方法。现在我有了类似的内容:

<?xml version="1.0" encoding="UTF-8"?>
<Root>
    <Points>
        <Point>
            <UIDP>1</UIDP>
            <X>5379847.689</X>
            <Y>1223602.644</Y>
            <MX>0.05</MX>
            <MY>0.05</MY>
        </Point>
        <Point>
            <UIDP>2</UIDP>
            <X>5379828.473</X>
            <Y>1223606.113</Y>
            <MX>0.05</MX>
            <MY>0.05</MY>
        </Point>
    </Points>
    <Lines>
        <Line>
            <Point>1</Point>/>
            <Point>2</Point>/>
        </Line>
    </Lines>  
</Root>

其中Line/Point为点唯一id(UIDP)的值。

1. 有没有办法让它更清楚，不仅得到ID而且得到洞点定义使用引用或类似的东西?
2. 如何使用XLink或XPointer?
如何在XSD Schema 1.1中定义它?

Answer 1

我没有找到如何通过XLink或XPointer制作它，但了解如何通过XSD定义部分规则。

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning" vc:minVersion="1.1">
    <xsd:complexType name="point">
        <xsd:sequence>
            <xsd:element name="UIDP" type="xsd:integer"/>
            <xsd:element name="X" type="xsd:float"/>
            <xsd:element name="Y" type="xsd:float"/>
            <xsd:element name="MX" type="xsd:float"/>
            <xsd:element name="MY" type="xsd:float"/>
        </xsd:sequence>
    </xsd:complexType>
    <xsd:complexType name="line">
        <xsd:sequence>
            <xsd:element name="Point1" type="xsd:integer"/>
            <xsd:element name="Point2" type="xsd:integer"/>
        </xsd:sequence>
        <xsd:assert test="Point1 != Point2"/>
    </xsd:complexType>
    <xsd:element name="Root">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="Points">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="Point" type="point" maxOccurs="unbounded"/>
                        </xsd:sequence>
                    </xsd:complexType>
                </xsd:element>
                <xsd:element name="Lines">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="Line" type="line" maxOccurs="unbounded"/>      
                        </xsd:sequence>
                    </xsd:complexType>
                    <xsd:unique name="lines_unique">
                        <xsd:selector xpath="Line"/>
                        <xsd:field xpath="Point1"/>
                        <xsd:field xpath="Point2"/>
                    </xsd:unique>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
        <xsd:key name="point_uidp">
            <xsd:selector xpath="Points/Point"></xsd:selector>
            <xsd:field xpath="UIDP"></xsd:field>
        </xsd:key>
        <xsd:keyref refer="point_uidp" name="point_1">
            <xsd:selector xpath="Lines/Line/Point1"></xsd:selector>
            <xsd:field xpath="."></xsd:field>
        </xsd:keyref>
        <xsd:keyref refer="point_uidp" name="point_2">
            <xsd:selector xpath="Lines/Line/Point2"></xsd:selector>
            <xsd:field xpath="."></xsd:field>
        </xsd:keyref>
    </xsd:element>
</xsd:schema>

schema定义的规则:

1. 所有的点id必须是唯一的，必须出现，不能为NULL
2. 所有的线点链接必须来自点id的范围
3. 行点链接必须是唯一的，不能在其他行
中复制。

Answer 2

。. NET DataSet类自动生成以下模式(为了清晰起见，我添加了空行):

<?xml version="1.0" standalone="yes"?>
<Root>
  <xs:schema id="Root" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema"
             xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xs:element name="Root" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="Point">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="UIDP" type="xs:int" />
                <xs:element name="X" type="xs:double" minOccurs="0" />
                <xs:element name="Y" type="xs:double" minOccurs="0" />
                <xs:element name="MX" type="xs:double" minOccurs="0" />
                <xs:element name="MY" type="xs:double" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
          <xs:element name="Line">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="Point1" type="xs:int" />
                <xs:element name="Point2" type="xs:int" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
      <xs:unique name="PK_Points" msdata:PrimaryKey="true">
        <xs:selector xpath=".//Point" />
        <xs:field xpath="UIDP" />
      </xs:unique>
      <xs:unique name="PK_Lines" msdata:PrimaryKey="true">
        <xs:selector xpath=".//Line" />
        <xs:field xpath="Point1" />
        <xs:field xpath="Point2" />
      </xs:unique>
      <xs:keyref name="FK_Lines2" refer="PK_Points" msdata:ConstraintOnly="true">
        <xs:selector xpath=".//Line" />
        <xs:field xpath="Point2" />
      </xs:keyref>
      <xs:keyref name="FK_Lines1" refer="PK_Points" msdata:ConstraintOnly="true">
        <xs:selector xpath=".//Line" />
        <xs:field xpath="Point1" />
      </xs:keyref>
    </xs:element>
  </xs:schema>
  <Point>
    <UIDP>1</UIDP>
    <X>5379847.689</X>
    <Y>1223602.644</Y>
    <MX>0.05</MX>
    <MY>0.05</MY>
  </Point>
  <Point>
    <UIDP>2</UIDP>
    <X>5379828.473</X>
    <Y>1223606.113</Y>
    <MX>0.05</MX>
    <MY>0.05</MY>
  </Point>
  <Line>
    <Point1>1</Point1>
    <Point2>2</Point2>
  </Line>
</Root>

方案与数据一起在单个文件中生成。

注意Points和Lines元素的缺失。

不幸的是，

是1.0版本的模式。因此，更高级的检查是不可用的。

可以删除msdata前缀的属性