XSL-FO page-master-alternatives 有时会耗尽

Question

我有一些强大的书籍样式表。目前，我不知道问题出在哪里。我的样式表有时有效，有时无效，这取决于 TOC 的长度，我可以根据我想要包含在其中的级别数动态更改它。

我的样式表是这样工作的（我的意图是）：

如果 TOC 的最后一页是奇怪，在它后面放一个空白页：

        <fo:page-sequence-master master-name="Imprints">
            <fo:repeatable-page-master-alternatives>
                <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank" page-position="any"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Title-Page" odd-or-even="odd" page-position="first"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.CopyRight-Page" odd-or-even="even" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.TOC" odd-or-even="odd" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.TOC" odd-or-even="even" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.TOC" odd-or-even="odd" page-position="last"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.TOC" odd-or-even="even" page-position="last"/>
            </fo:repeatable-page-master-alternatives>
        </fo:page-sequence-master>

让主要部分 Content-Pages 从 TOC 之后的第一个奇数页（或它后面的空白页）开始，让每一章都从奇数页开始在上一章（最后一页或空白）之后并在偶数页结束。如果最后一页应该是奇数，强制空白页（我想这可能是问题所在，因为我处理了整个部分以及特定章节）：

        <fo:page-sequence-master master-name="Content-Pages">
            <fo:repeatable-page-master-alternatives>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right.First" odd-or-even="odd" page-position="first"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank" page-position="any"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Left" odd-or-even="even" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right" odd-or-even="odd" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Left" odd-or-even="even" page-position="last"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right" odd-or-even="odd" page-position="last"/>
            </fo:repeatable-page-master-alternatives>
        </fo:page-sequence-master>

我这样称呼它们（我不确定force-page-count="even"和[=17=之间有什么区别。我已经检查了一些文档，但我仍然不清楚）：

    <fo:page-sequence master-reference="Imprints" force-page-count="even">
        <fo:flow flow-name="xsl-region-body">
            <fo:block>
                <xsl:apply-templates select="//tei:TEI/tei:teiHeader" mode="draft"/>
            </fo:block>
        </fo:flow>
    </fo:page-sequence>
    <fo:page-sequence master-reference="PageMaster.CopyRight-Page">
        <fo:flow flow-name="xsl-region-body">
            <fo:block xsl:use-attribute-sets="p">
                © Copyright!
            </fo:block>
        </fo:flow>
    </fo:page-sequence>
    <fo:page-sequence master-reference="PageMaster.TOC">
        <fo:flow flow-name="xsl-region-body">
            <fo:block>
                <xsl:apply-templates select="//tei:TEI/tei:text" mode="toc"/>
            </fo:block>
        </fo:flow>
    </fo:page-sequence>
    <xsl:for-each select="//tei:div[@n='1']">
        <fo:page-sequence master-reference="Content-Pages" force-page-count="end-on-even">
            <fo:static-content flow-name="Region-Before-Left">
                <fo:block xsl:use-attribute-sets="running-header-left">
                    <fo:inline xsl:use-attribute-sets="running-header-pageno-left">
                        <fo:page-number/>
                    </fo:inline>
                </fo:block>
            </fo:static-content><!-- Running header right -->
            <fo:static-content flow-name="Region-Before-Right">
                <fo:block xsl:use-attribute-sets="running-header-right">
                    <fo:inline xsl:use-attribute-sets="running-header-pageno-right">
                        <fo:page-number/>
                    </fo:inline>
                </fo:block>
            </fo:static-content>
            <fo:static-content flow-name="xsl-footnote-separator">
                <fo:block>
                    <fo:leader xsl:use-attribute-sets="footnote-separator"/>
                </fo:block>
            </fo:static-content>
            <fo:flow flow-name="xsl-region-body">
                <xsl:apply-templates select="."/>
            </fo:flow>
        </fo:page-sequence>
    </xsl:for-each>

当它失败并抛出 Subsequences exhausted in page-sequence-master "Content-Pages", cannot recover. (No context info available) 时，它有助于更改 force-page-count 或添加另一个对 PageMaster.Page-Right.First 的引用并使其在 even 页面上成为可能。有了这些章节，有时会从奇数页开始，但有页码（它们不应该）。真是一头雾水。

连加：

<fo:conditional-page-master-reference master-reference="PageMaster.Page-Right.First" odd-or-even="odd" page-position="rest"/>

...没有帮助。

我使用最后的 Saxon HE 和 Apache FOP 1.1。

更新

进度根据@Tony_Graham:

        <fo:page-sequence-master master-name="Imprints">
            <fo:repeatable-page-master-alternatives>
                <fo:conditional-page-master-reference master-reference="PageMaster.Title-Page" odd-or-even="odd" page-position="first"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.CopyRight-Page" odd-or-even="even" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.TOC"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            </fo:repeatable-page-master-alternatives>
        </fo:page-sequence-master>
        <fo:page-sequence-master master-name="Content-Pages">
            <fo:repeatable-page-master-alternatives>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right.First" odd-or-even="odd" page-position="first"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Left" odd-or-even="even" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right" odd-or-even="odd" page-position="rest"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Left" odd-or-even="even" page-position="last"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right" odd-or-even="odd" page-position="last"/>
                <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            </fo:repeatable-page-master-alternatives>

其余的：

<fo:page-sequence master-reference="Imprints" force-page-count="end-on-even">
...

<fo:page-sequence master-reference="PageMaster.CopyRight-Page" initial-page-number="auto-odd">
...

Answer 1

将 force-page-count="end-on-even" 放在 fo:page-sequence 之前每个 fo:page-sequence 您想要从奇数页开始。或者，在 fo:page-sequence 上设置 initial-page-number="auto-odd"。参见 https://www.w3.org/TR/xsl11/#initial-page-number

force-page-count="even" 表示如果页面序列从偶数页开始，它将在奇数页结束以使其成为偶数页，反之亦然，如果它从奇数页开始. force-page-count="end-on-even" 将在奇数页结束，而不管页面序列是从奇数页还是偶数页开始。（AH Formatter 有扩展以在 'doubly-even' 结束，此外还有更多，并强制整个文档的页数在偶数页结束等。参见 https://www.antennahouse.com/product/ahf63/ahf-ext.html#axf.force-page-count）但是，很可能 initial-page-number 会做你需要的。

还有：

您不需要重复 fo:conditional-page-master-reference 两个不同的 odd-or-even 到 select 相同的 page-master。这与没有 odd-or-even 的 fo:conditional-page-master-reference 相同，因为默认值为 any。参见 https://www.w3.org/TR/xsl11/#odd-or-even。
您可以删除显式 page-position="any"，因为这是默认设置。
"Imprints"有两个'odd-or-even="even" page-position="rest"'，所以永远不会用到第二个。
为 odd/even 和 rest/last 选择相同的 "PageMaster.TOC" 可以减少到 page-position="any"。

更新

您可以将当前的 fo:page-sequence-master 更改为：

    <fo:page-sequence-master master-name="Imprints">
        <fo:repeatable-page-master-alternatives>
            <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Title-Page" page-position="first"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.CopyRight-Page" odd-or-even="even" page-position="rest"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.TOC"/>
        </fo:repeatable-page-master-alternatives>
    </fo:page-sequence-master>
    <fo:page-sequence-master master-name="Content-Pages">
        <fo:repeatable-page-master-alternatives>
            <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right.First" page-position="first"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Page-Left" odd-or-even="even"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right" odd-or-even="odd"/>
        </fo:repeatable-page-master-alternatives>

在 fo:repeatable-page-master-alternatives、"the conditions are tested in order from the beginning of the sequence of children" 内，因此您想将最不可能的备选方案放在首位。（请参阅 https://www.w3.org/TR/xsl11/#fo_repeatable-page-master-alternatives）您还希望在最后有一个包罗万象的替代方案，但您已经做到了。

但是，我不明白为什么 "Imprints" 包含 "PageMaster.CopyRight-Page" 和 "PageMaster.TOC"，而版权页和目录分别位于引用特定页面的单独页面序列中-主人。您可能想要更像：

    <fo:page-sequence-master master-name="Imprints">
        <fo:repeatable-page-master-alternatives>
            <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Title-Page"/>
        </fo:repeatable-page-master-alternatives>
    </fo:page-sequence-master>
    <fo:page-sequence-master master-name="TOC">
        <fo:repeatable-page-master-alternatives>
            <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.TOC"/>
        </fo:repeatable-page-master-alternatives>
    </fo:page-sequence-master>
    <fo:page-sequence-master master-name="CopyRight-Page">
        <fo:repeatable-page-master-alternatives>
            <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.CopyRight-Page"/>
        </fo:repeatable-page-master-alternatives>
    </fo:page-sequence-master>
    <fo:page-sequence-master master-name="Content-Pages">
        <fo:repeatable-page-master-alternatives>
            <fo:conditional-page-master-reference master-reference="PageMaster.Blank" blank-or-not-blank="blank"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right.First" page-position="first"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Page-Left" odd-or-even="even"/>
            <fo:conditional-page-master-reference master-reference="PageMaster.Page-Right" odd-or-even="odd"/>
        </fo:repeatable-page-master-alternatives>
...
<fo:page-sequence master-reference="Imprints">
...
<fo:page-sequence master-reference="CopyRight-Page" initial-page-number="auto-odd">
...
<fo:page-sequence master-reference="PageMaster.TOC" initial-page-master="auto-odd">
...
<xsl:for-each select="//tei:div[@n='1']">
    <fo:page-sequence master-reference="Content-Pages" initial-page-number="auto-odd">

XSL-FO page-master-alternatives 有时会耗尽

XSL-FO page-master-alternatives sometimes exhausted

xsl-fo